Tomcat is an open-source web server application that offers a Java HTTP server. This enables the users to execute java files easily. It is the best web environment for running java applications.It is responsible for the deployment of JSP and Java Servlet applications. For that deployment, we need to create a war file. The configuration of Tomcat is done by editing server.xml file.Some of the unique features of Tomcat application server are configuration management, reliable restarts and advanced deployment functionality.