To run a WAR (Web ARchive) file in Apache Tomcat, you will need to have Apache Tomcat installed and running on your computer. You can download Apache Tomcat from the Apache Tomcat website (https://tomcat.apache.org/) and follow the instructions for installation.
Once Apache Tomcat is installed and running, you can follow these steps to deploy a WAR file:
Copy the WAR file to the webapps directory in your Apache Tomcat installation. The webapps directory is the default location for deploying web applications in Apache Tomcat.
Start Apache Tomcat if it is not already running. You can start Apache Tomcat by running the catalina.sh script in the bin directory of your Apache Tomcat installation.
Open a web browser and enter the URL for your web application. The URL will be in the form http://localhost:8080/[webappname], where [webappname] is the name of the WAR file without the .war extension. For example, if the WAR file is mywebapp.war, the URL will be http://localhost:8080/mywebapp.
The web application will be deployed and you should see the application homepage in your web browser.