Question

What is the difference between SaaS, PaaS, and IaaS?

Answer 1

What is the difference between SaaS, PaaS, and IaaS?

This is one of the most common Azure interview questions. Cloud Computing has three types of service models, that are IaaS, PaaS, and SaaS

Infrastructure as a Service(IaaS)

Platform as a Service(PaaS)

Software as a Service(SaaS)

It provides users with components such as OS, networking capabilities, etc. This is a paid service, based on usage and can be used to host applications.

It enables developers to build and work with applications without having to worry about the infrastructure or management of the hosting environment.

It involves applications being consumed and used by organizations. Usually, organizations pay for their use of the application

Example -  Azure Virtual Machine, Azure VNET

Example -  Azure SQL, Azure Storage

Example -  Office 365, Salesforce

Azure Interview Questions and Answers for Experienced

🔗Reference : stackoverflow.com

🔗Source: Azure Interview Questions and Answers

Answer 2

The summary of these terminologies is as follows --

IaaS -- Infrastructure as a Service -- a set of infrastructure level capabilities such as an operating system, network connectivity, etc. that are delivered as pay for use services and can be used to Host applications.

Example, Azure VM, VNET.

PaaS -- Platform as a Service -- is about abstracting developers from the underlying infrastructure to enable applications to quickly be composed. This is specifically for developers who are willing to Build applications without worrying about management of hosting environment at all. Example, Azure Cloud services, Azure Web Apps, Storage, SQL Azure Database and so on.

SaaS -- Software as a Service -- applications that are delivered using a service delivery model where organizations can simply Consume and use the application. Typically, an organization would pay for the use of the application or the application could be monetized through ad revenue.

Example, Office 365, Gmail, Saleforce.com, SharePoint online, CRM online and so on.

Answer 3

IaaS- IaaS stands for Infrastructure as a Service. It is a cloud computing service that hosts apps on the infrastructure and allows you to avail storage, networking resources, etc., on demand. Each resource is available as an individual service facility, and one has to only pay for it for as long as he needs to use it. Azure VM, VNET, etc., are some popularly known examples of IaaS.

PaaS- PaaS stands for Platform as a Service. It offers both- a cloud development and deployment environment, with facilities that enable users to produce simple cloud-based apps or even complex, cloud-enabled business systems. A user only pays for the resources he needs from a cloud service provider and accesses them over a secure Internet connection. Users are in charge of the applications and services they create, and the cloud service provider manages the rest.  Azure web apps, Storage services, cloud services, and other services are all examples of PaaS.

SaaS- SaaS stands for Software as a Service. Organizations avail SaaS applications through a service delivery mechanism. This works by charging the organization for their use or by displaying advertisements. User interaction with cloud-based programs through the Internet can occur through software as a service (SaaS). The service provider's data center hosts the underlying infrastructure, software, and app data. Applications such as Office 365, Gmail, SharePoint Online, and others are examples of SaaS.