Difference between web-server and servlet container

Question

What is the difference between \"A Web Server\" and \"A Servlet Container\"?
In general are all Web Servers Servlet(Web) Containers too or vice versa?

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Answer 1

A Servlet Container is a Web Server that must be able to run Java Servlets.

Web Server, on the other hand, is a broader term including all software running and communicating through HTTP protocol.

Under these definitions:

1. All Servlet Containers are Web Servers
2. Not all Web Servers are Servlet Containers. I.E. Apache HTTP Server can not run Java Servlet directly.