Differentiate

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Difference between IaaS, PaaS, SaaS?

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Difference between IaaS, PaaS, SaaS?

Here’s a concise comparison of the three cloud service models:

IaaS (Infrastructure as a Service)

What you get: Virtualized computing resources over the internet—servers, storage, networking, and basic computing infrastructure.
Provider responsibility: Physical hardware, virtualization, and core IaaS services (compute, storage, networking).
Customer responsibility: Install and manage OS, middleware, runtime, applications, and data; configure security, backups, and scaling.
Examples: Amazon EC2, Google Compute Engine, Microsoft Azure Virtual Machines, OpenStack-based services.
PaaS (Platform as a Service)

What you get: A managed platform that abstracts away the underlying OS and runtime. You deploy applications, and the platform handles runtime, middleware, and OS provisioning.
Provider responsibility: Infrastructure plus the platform layer (runtime environments, databases, middleware, scaling, patching, backups, security).
Customer responsibility: Develop, deploy, and manage applications and data; less control over the underlying environment.
Examples: Google App Engine, Heroku, AWS Elastic Beanstalk, Azure App Service.
SaaS (Software as a Service)

What you get: Fully functional software applications delivered over the internet. You access and use the software; no installation or maintenance on your side.
Provider responsibility: Entire stack—from application to infrastructure, including updates, security, and backups.
Customer responsibility: User configuration (where applicable), data input, and usage governance.
Examples: Google Workspace, Microsoft 365, Salesforce, Slack.
Key distinctions

Control vs. convenience: IaaS offers the most control; SaaS offers the least control but maximum convenience; PaaS sits in between.
Responsibility split:
IaaS: you manage OS and above.
PaaS: provider manages runtime/platform; you manage your code and data.
SaaS: provider manages everything; you just use the software.
Typical use cases:
IaaS: custom environments, lift-and-shift migrations, sensitive or bespoke software requiring fine-tuned control.
PaaS: rapid application development, microservices, teams wanting reduced operational overhead.
SaaS: standard business software with minimal setup (Email, CRM, collaboration tools).