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# THIRD-PARTY MODULES
Many webtrees functions are provided by “modules”.
Modules allows you to add additional features to webtrees and modify existing features.
## Installing and uninstalling modules
A module is a folder containing a file called `module.php`.
There may be other files in the folder, such as CSS, JS, templates,
languages, data, etc.
To install a module, copy its folder to `/modules_v4`.
To uninstall it, delete its folder from `/modules_v4`.
Note that module names (i.e. the folder names) must not contain
spaces or the characters `.`, `[` and `]`. It must also have a
maximum length of 30 characters.
TIP: renaming a module from `<module>` to `<module.disable>`
is a quick way to hide it from webtrees. This works because
modules containing `.` are ignored.
## Writing modules
To write a module, you need to understand the PHP programming language.
There are several example modules available at
https://github.com/webtrees
The built-in modules can be found in `app/Module/`.
These contain lots of useful examples that you can copy/paste.
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