Apache tomcat is also known as tomcat. It is the most widely used web application. Apache tomcat  is a free web server developed from the Apache Software Foundation unit. It is follows Java EE specifications and provides a HTTP web server. Its components include Catalina - a servlet container, Coyote - a connector component, Jasper – a JSP engine and cluster – a load balancing component. It is an open-source web server application that offers a Java HTTP server.