Service Models

SaaS

·       SaaS stands for Software-as-a-Service
·       Provides a facility to the user to use the software from anywhere with the help of an internet connection. It is also known as software on demand.
·       There are various benefits of the SaaS as it is economical and only the user has to pay for some of the basic costs such as licensing fees, installation costs, maintenance fees, and support fees.
·       Examples are Yahoo! Mail, Hotmail, Gmail, Facebook and Salesforce etc…

SaaS is like renting a house: the landlord maintains the house

PaaS

·       PaaS stands for Platform-as-a-Service.
·       This helps the user by providing the facility to make, publish, and customize the software in the hosted environment. An internet connection helps to do it.
·       It also has several benefits such as it has lower costs and only the user has to pay for the essential things.
·       The host of a PaaS has the hardware and software of its own. This frees the user from installing the hardware and software to execute a new application.
·       Examples are Heroku, Microsoft Azure and Elastic Beanstalk etc…

PaaS is like renting all the tools and equipment necessary for building a house

IaaS

·       IaaS stands for Infrastructure-as-a-Service.
·       With the help of IAAS, the user can use IT hardware and software just by paying the basic price of it.
·       The companies that use IaaS are IBM, Google, and Amazon.
·       For small start-ups and firms, the IaaS has the major advantage as it benefits them with the infrastructure rather than spending a large amount of money on hardware and infrastructure. 
·       The reason for choosing IaaS is that it is easier, faster, and cost-efficient which reduces the burden of the organizations.
·       Examples are EC2 etc…

IaaS is like a company leasing a plot of land on which they can build whatever they want