Installing Tomcat 9 on Debian 9 is fairly easy task, just carefully follow our tutorial bellow and you should have Tomcat 9 installed on your Debian 9 server in less then 10 minutes. Tomcat is an open source web server and servlet container developed by the Apache Software Foundation, it was previously known as Tomcat or Jakarta Tomcat. Tomcat is required if you want to deploy and execute Java applications that are written in Java technologies including Java Servlet, JSP, etc. In this tutorial, we show you how to install Tomcat 9 on Debian 9. If your machine is running CentOS 7, you can follow our tutorial on how to install Tomcat 9 on CentOS 7.