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A lesser known fact is that WordPress actually features two plugin directories. The primary directory is located at wp‐content/plugins in a standard WordPress installation. The second, lesser known plugin directory is at wp‐content/mu‐plugins. The mu‐plugins directory, which stands for Must‐Use, is not automatically created by WordPress, so it must be manually created to be used.

The primary difference between the two is that the mu‐plugins directory is for plugins that are always executed. This means any plugin included in this directory will automatically be loaded in WordPress and across all sites in the network if you run Multisite. Mu‐plugins are always on and cannot be deactivated.

NOTE The mu‐plugins directory will not read plugins in a subfolder, so all plugins must be individual files or must include additional files that exist in a subdirectory. Any plugin files in a subfolder will be ignored unless included in the primary plugin file.