What is Tomcat?

Apache Tomcat is an open source web server developed by the Apache Software Foundation.

The application server is designed to execute Java servlets and render Web pages that include Java Server Page coding.

It is described as a “reference implementation” of the Java Servlet and the Java Server Page specifications.

Tomcat can be used as either a standalone product with its own internal Web server, or together with other Web servers such as Apache, Netscape Enterprise Server, Microsoft Personal Web Server, and Microsoft Internet Information Server.

What collection is Tomcat a part of?