Public, Private, Hybrid and Multicloud Explained (Cloud for Beginners, Part 16)
Public, private, hybrid and multicloud explained in plain English for freshers, with a real egress cost example and the interview question that always comes up.
TL;DR. Public cloud is renting computers from a provider. Private cloud is a dedicated setup only your company uses. Hybrid joins a private or on-premises system with public cloud so they act as one. Multicloud means using two or more public providers at once. Most companies end up both hybrid and multicloud, often by accident rather than a grand plan. As a fresher, learn one provider well before you chase the rest.
Who this is for. A fresher or new IT hire who keeps hearing words like hybrid and multicloud in meetings and nods along without being sure what they mean. No prior cloud work assumed. By the end you can tell the four models apart, explain why a company picks one, and answer the interview question that almost always shows up.
Your bank keeps your account ledger inside its own data center, locked down and audited. Its mobile app, the one you tap to check a balance, runs on a public cloud somewhere. That one sentence is a hybrid cloud, and almost every large company you will work for is built this way. The trouble is that nobody sits a fresher down and explains the words. People say hybrid, multicloud, private, public as if you already know, and the meanings quietly drift depending on who is talking.
So here is the plain version. There are only four ideas, they fit together neatly, and once you see them you will spot them in every architecture diagram for the rest of your career.
The four words, settled once
Think of computing capacity like places to live. Public cloud is an apartment in a huge building run by a landlord such as AWS, Microsoft Azure, or Google Cloud. You rent what you need, the landlord owns the building and the plumbing, and thousands of other tenants share that same building behind locked doors. Private cloud is a house you own or lease for your company alone. Nobody else lives there. You pay for the whole thing whether the rooms are full or empty, and in return you control everything.
Hybrid cloud is owning a house and also renting an apartment, then living across both as if they were one home. Multicloud is renting apartments in two different buildings from two different landlords at the same time. Notice the difference: hybrid mixes types of cloud (private plus public), while multicloud uses more than one provider of the same type (several public clouds). A company can be both at once, and many are.
The four deployment models at a glance. Hybrid mixes private and public; multicloud uses several public providers.
Model
Who uses the hardware
You pay for
Picked when
Public
Many tenants share
What you use
Speed and scale matter
Private
Your company only
The whole setup
Control or rules demand it
Hybrid
Both, joined together
Each side plus the link
Some data must stay home
Multicloud
Several providers
Each provider
Flexibility or merger fallout
Public cloud: renting by the hour
This is the default mental image most people have of the cloud. You open an account, ask for a virtual machine or a database, and a few seconds later it exists. You pay for the minutes or gigabytes you actually use, and when you delete it the bill stops. The provider owns the buildings, the power, the cooling, and the physical servers. You never touch the metal.
The win is speed and scale. A two-person startup can run on the same class of machines as a bank, and grow from one server to a thousand on a busy day without buying anything. The catch is that the meter never stops, and someone else owns the building your business now lives in.
Private cloud: your own fenced yard
A private cloud gives you the convenient parts of cloud, like asking for a server through a portal and getting it in minutes, but on hardware reserved for one organization. It might sit in a company data center or in space rented from a provider where the machines are not shared with other tenants. People reach for it when a rule, a regulator, or a security team says certain data cannot live on shared infrastructure.
Be careful with the phrase, though. A rack of old servers in a closet with no self-service portal is not a private cloud, it is just on-premises hardware. The word cloud implies you can request and release resources on demand. Plenty of teams call their data center a private cloud when it is really just servers they own.
Hybrid cloud: one system, two homes
Hybrid is the most common shape for real companies, and the bank example is exactly it. Sensitive records stay in a private or on-premises system because a regulator insists or because moving them would be slow and risky. Everything customer-facing, the website and the app, runs in public cloud where it can scale on demand. A private network link joins the two so an app in the public cloud can read from a database that never left the building.
Why companies stay hybrid for years
Migrating a thirty-year-old core system is expensive, slow, and dangerous, so many firms simply never finish. Hybrid is not always a stepping stone to full cloud. For a lot of banks, hospitals, and government bodies it is the permanent answer, and recent industry surveys back this up: around 70 to 73 percent of organizations run hybrid setups, rising to roughly 78 percent among the largest enterprises.
Hybrid: data that must stay home stays put, while the public side handles scale, joined by a private link.
Why this matters in your first job. When you join a team, ask early where the data actually lives. The same app can behave very differently if its database is across a private link in another building versus right next to it in the same cloud. Latency, failure modes, and who you call at 2 a.m. all change. Knowing the deployment model tells you why the system is shaped the way it is, and stops you from suggesting a fix that ignores the rule keeping that data on-premises.
Multicloud: more than one landlord
Multicloud means a company uses two or more public providers. Maybe the main app runs on AWS, the data team likes Google Cloud for analytics, and the office tools and identity sit in Microsoft Azure. The numbers here are striking: surveys put multicloud use at roughly 86 percent of organizations, with the average company spread across about 2.4 public providers.
Here is where I will disagree with the usual sales pitch. You will hear that companies go multicloud on purpose to avoid vendor lock-in. In practice, most multicloud is accidental. It arrives through acquisitions where the company you bought ran on a different cloud, through a data team that quietly signed up for another provider, or through SaaS tools that each sit on their own cloud. Treating multicloud as a clever strategy when it is really sprawl leads to teams that half-know three clouds and master none. For a fresher, the lesson is blunt: do not try to learn all three at once to look multicloud-ready. Learn one deeply. The second and third get much easier, and real lock-in lives in how you build, not in the logo on the invoice.
Multicloud: one company, several public providers, each carrying a different job. Often this grows by accident.
The gotcha nobody warns freshers about: egress
Moving data into a cloud is free. Moving it out to the internet is not. This charge is called data egress, and it is the single most common surprise on a multicloud or hybrid bill. Sending data between two providers means you pay the sending side to push it out, every gigabyte, every time. As of 2026 the published internet egress rates sit around 0.09 US dollars per GB on AWS, about 0.087 on Azure, and roughly 0.12 on Google Cloud, usually after a small free monthly allowance of about 100 GB.
Worked example: a small multicloud bill. Say your app on one cloud sends 10 terabytes a month to a data pipeline on another cloud. That is 10,000 GB. At roughly 0.09 US dollars per GB, after the first free 100 GB, the egress alone is about 9,900 times 0.09, near 891 US dollars every month, around 10,700 a year, just to move your own data between two clouds you already pay for. Nobody approved that line item on purpose. It grew quietly, which is exactly how multicloud bills tend to surprise people.
One useful update: in 2024 all three big providers agreed to waive egress fees when you fully leave their cloud, partly under regulatory pressure. That helps if you are migrating away for good, but it has strict conditions, such as a 60 day window and removing everything, and it does nothing for the day to day traffic between clouds you keep running. So the egress trap on ordinary multicloud traffic is still very real.
How the big three handle hybrid
Each major provider sells a way to run its services on hardware that sits in your own building, so the public cloud and your data center feel like one control panel. They are close cousins, and which one a company uses usually follows which cloud it already runs.
AWS offers Outposts, a rack of AWS-built hardware delivered to your site that runs familiar services like EC2 and EBS locally. Microsoft offers Azure Arc, which extends Azure management out to servers and Kubernetes clusters wherever they run, alongside the Azure Stack family for on-site hardware. Google offers GKE Enterprise, the platform once called Anthos, which is built around Kubernetes so the same workloads run across Google Cloud, your data center, and even other clouds. Treat these as three answers to the same question rather than three different ideas.
A simple way to reason about the choice. Most real companies land on hybrid, and many become multicloud on top.
Real interview question.What is the difference between hybrid cloud and multicloud? A strong answer is short and does not muddle the two. Say: hybrid mixes different kinds of environment, a private or on-premises system together with public cloud, joined so they work as one. Multicloud means using more than one public provider at the same time, for example AWS and Azure. Then add the line that shows real understanding: a company can be both at once, and many large ones are. If you want to stand out, mention that multicloud often grows by accident through mergers and team choices rather than a deliberate plan, and that egress fees between clouds are a common hidden cost.
Try it yourself. You can feel what multicloud means using two free tiers, no money spent. Create a free account on any one provider and make an object storage bucket, for example an S3 bucket on AWS. Create a free account on a second provider and make a storage container there too, such as an Azure storage account. Congratulations, you are now technically multicloud. Now find each provider data transfer or egress pricing page and read the per GB outbound rate. How to check you got it: you should be able to state, in one sentence, what it would cost to copy 1 TB out of each bucket to the internet. If those two numbers are different, you have just seen first-hand why moving data between clouds is the part that quietly costs money.
FAQ
Is hybrid cloud the same as multicloud? No. Hybrid combines private or on-premises with public cloud so they act as one system. Multicloud means using two or more public providers. They are different ideas, and a company can run both at the same time.
Why would a company not just put everything in one public cloud? Sometimes a regulator or security policy says certain data cannot leave the building, which forces a private or hybrid setup. Other times the company inherited a second cloud through an acquisition, or different teams chose different providers. Cost and avoiding total dependence on one vendor also play a part.
Does multicloud really avoid vendor lock-in? Less than the marketing suggests. Real lock-in comes from how you build, the managed services and APIs you depend on, not simply from having one provider. Spreading across clouds can add complexity and egress costs while leaving the deeper lock-in untouched.
Is private cloud just another name for on-premises servers? Not quite. On-premises means hardware you own and run. A private cloud adds the cloud experience on top, such as requesting and releasing resources through a portal, on hardware dedicated to one organization. Plain old servers in a room are not a private cloud.
As a fresher, which model should I learn first? Learn one public cloud deeply before anything else. The core ideas of compute, storage, networking, and identity carry across providers, and hybrid and multicloud make far more sense once you truly know one cloud well.
The takeaway
Four words, one map. Public is shared rental, private is yours alone, hybrid joins the two, multicloud spreads across providers. Real companies usually end up hybrid, often multicloud on top, and a fair amount of that spread happened by accident rather than design. Your job as a fresher is not to memorize every provider hybrid product. It is to ask where the data lives, why it lives there, and what it costs to move it. Get into that habit now and you will read architecture diagrams like someone with years more experience.
Your move: open two free tiers this week, make a bucket on each, and write down the egress cost of moving 1 TB out of each. That one exercise will teach you more about multicloud than any slide deck.
Dr. Pranay Jha is a Cloud and AI Consultant with 18+ years of experience in hybrid cloud, virtualization, and enterprise infrastructure transformation. He specializes in VMware technologies, multi-cloud strategy, and Generative AI solutions. He holds a PhD in Computer Applications with research focused on Cloud and AI, has published multiple research papers, and has been a VMware vExpert since 2016 and a VMUG Community Leader.
Dr. Pranay Jha is a Cloud and AI Consultant with 18+ years of experience in hybrid cloud, virtualization, and enterprise infrastructure transformation. He specializes in VMware technologies, multi-cloud strategy, and Generative AI solutions. He holds a PhD in Computer Applications with research focused on Cloud and AI, has published multiple research papers, and has been a VMware vExpert since 2016 and a VMUG Community Leader.
DrJha