Explain how to use WordPress action and filter hooks, providing specific examples of where and why to use each.

WordPress action and filter hooks are fundamental to extending and customizing the platform. They allow you to modify WordPress's core behavior without directly altering core files. This is crucial for maintaining the integrity of the WordPress system and ensures that your customizations are preserved during updates. Hooks provide a flexible way to add, modify or remove functionality. The two main types of hooks are action hooks and filter hooks. Action hooks allow you to execute custom code at specific points in the WordPress execution process. They work like event listeners; when a particular action occurs, WordPress triggers the hook, and any code that's attached to that hook will be executed. Action hooks are used to perform tasks such as sending emails, updating data, or modifying HTML output. You use the `add_action()` function to attach your custom function to an action hook. The syntax for adding a custom function to a hook is: `add_action('action_name', 'your_custom_function_name', priority, number_of_arguments )`. The `'action_name'` is the name of the WordPress action you want to hook into, `'your_custom_function_name'` is the name of your custom function, the `priority` is the order it will execute, and `number_of_arguments` is the number of arguments passed to the function. A common example of using an action hook is adding custom content to the WordPress footer. WordPress has the action hook called `wp_footer` which is triggered r....