Apache HTTP Server (Apache) is an open source Web server of the Apache Software Foundation, which can run on most computer operating systems, and is one of the most popular Web server-side software due to its extensive use of multiple platforms and security.
Apache HTTP Server (Apache) is an open source Web application Server for the Apache Software Foundation, which is a lightweight application server that is commonly used in small and medium-sized systems and in situations where concurrent access users are not many.
Apache is a normal server, it only supports HTML static ordinary Web page, so it can not explain the Java program. However, PHP can be supported via plugins and can be connected to Tomcat (one-way Apache connection Tomcat, which means that Tomcat resources can be accessed via Apache, or vice versa). Tomcat was developed by Apache, Sun, and other companies and individuals, and with Sun's involvement and support, the latest servlet and JSP specifications are always reflected in Tomcat, which implements the servlet and JavaServer Page (JSP) support, and provides some unique features as a Web server.
Tomcat can be an extension of Apache, or it can be run independently of Apache.
The difference between Apache and Tomcat