WordPress hooks are fundamental to plugin development. Actions allow your plugin to execute code at specific points, while filters modify data before display or storage. Mastering both is essential for creating robust plugins. Actions fire when WordPress reaches certain points in execution, letting you inject custom functionality. Filters intercept data and return modified versions. Understanding the difference between these two hook types will elevate your plugin development skills significantly. Always use apply_filters() for data modification and do_action() for execution points.