'What is the use of Mercury and Tomcat in Xampp control panel?

Recently I installed Xampp server.

I know apache is used to run php server scripts and MySQL is used for database actions and FileZilla for transfering files to web to server.

But I don't understand what the Mercury and Tomcat Modules are for, can some explain?



Solution 1:[1]

Mercury :

Its a package to send emails. Its a local mail server.

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Tomcat :

The Apache Tomcat software is an open source implementation of the Jakarta Servlet, Jakarta Server Pages, Jakarta Expression Language and Jakarta WebSocket technologies.

Tomcat official website

Getting Started with Tomcat

XAMPP Control Panel with Modules :

enter image description here

Sources

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Source: Stack Overflow

Solution Source
Solution 1 Joe DF