Action in WordPress is a snippet of PHP code that developers can use to modify how a WordPress site works or add new features to it. Actions is an amazing feature that makes WordPress completely customizable.

Throughout the WordPress code, developers can “hang” their own code on “hooks”. There are two types of hooks: filter hooks and action hooks. Filter and action hooks are the foundation of how WordPress themes, core, and plugins work. Action hooks are where developers can place action.

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