In WordPress, a “mu-plugin” (short for “must-use plugin”) is a plugin that is loaded automatically and cannot be deactivated through the WordPress admin area. Mu-plugins are stored in a unique directory (wp-content/mu-plugins) and are intended for use by WordPress administrators to add custom functionality to their sites.
Mu-plugins are helpful for adding custom code or functionality to a WordPress site that cannot be removed or deactivated by site users. For example, you might use a mu-plugin to add custom code to your site’s header or footer or to add custom shortcodes or custom post types.
To create a mu-plugin, you can create a new PHP file and save it to the mu-plugins directory. The plugin will be automatically activated and cannot be deactivated by site users.
It is important to note that mu-plugins are loaded before regular plugins, so they can be used to override or modify the behaviour of standard plugins. This can be useful in situations where you need to alter the behaviour of a plugin without changing the plugin code directly.
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