Apache Tomcat (also referred to as Tomcat Server) implements several Java EE specifications including Java Servlet, JavaServer Pages (JSP), Java EL, and WebSocket, and provides a "pure Java" HTTP web server environment in which Java code can run.

1. Apache Tomcat
Apache Tomcat (also referred to as Tomcat
Server) implements several Java EE
specifications including Java Servlet, JavaServer
Pages (JSP), Java EL, and WebSocket, and
provides a "pure Java" HTTP web server
environment in which Java code can run.

2. Apache Tomcat
Catalina (a servlet container)
Coyote (an HTTP connector)
Jasper (a JSP engine)

3. Apache Tomcat

4. Apache Tomcat
Apache JServ Protocol (AJP) is a binary protocol
that can proxy inbound requests from a web
server through to an application server that sits
behind the web server.

5. Apache Tomcat