WordPress hooks represent the mechanism by which custom code interacts with the core code in WordPress. These hooks allow developers to insert their own code into various events within WordPress, enabling them to customize or modify its functionality in some way. WordPress hooks are divided into two categories: action hooks and filter hooks.
Action hooks are automatically triggered when WordPress executes a specific event; developers can insert their own code into these hooks to perform custom operations when such events occur. For example, the `add_action()` function can be used to add a function to the WordPress `init` event, so that the function is executed when WordPress is initialized.
The `filter` hook is a function used to modify WordPress content. It allows developers to intercept the delivery of WordPress content and modify it accordingly. Developers can use the `add_filter()` function to register their own functions with specific WordPress filter events in order to modify the content.
Using WordPress hooks allows developers to easily modify WordPress's functionality without altering its core code. This makes upgrading WordPress much simpler, as custom functionality can be seamlessly retained.
