Difference between SaaS App & Web App

Question

Anybody, please explain the differences between a SaaS App and Web App. Also how can we make a Java Web App, a SaaS App?

Answer 1

For me Saas (Software as a Service) is when you provide your application without any infrastructure requirement from the client, so the client could use your software without take care about the systems that support your software. A web app is a Saas application if the application runs in the provider infrastructure.