What is SaaS?
SaaS is an abbreviation of “Software as a Service”.
Refers to software provided in the cloud. Instead of installing the software on the user side, the vendor (provider) side runs the software, and the user leverages the functionality of the software via the network. Can think of what has been sold as packaged products up to now as available via the Internet.
Examples include email services such as Gmail, blog services, and services such as Salesforce. It is is useful in the sense that you can achieve the purpose immediately, but if you have low degrees of freedom and you want to use your own program, you need to use PaaS or IaaS as described.