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The best way to understand what a hook does is to look at where it occurs in the source code.
do_action( "hook_name" )apply_filters( "hook_name", "what_to_filter" ).Remember, this hook may occur in more than one file. Moreover, the hook's context may change from version to version.
| Line | Code | 
|---|---|
| 2649 |  * Determines if Widgets library should be loaded. | 
| 2650 |  * | 
| 2651 |  * Checks to make sure that the widgets library hasn't already been loaded. If | 
| 2652 |  * it hasn't, then it will load the widgets library and run an action hook. | 
| 2653 |  * | 
| 2654 |  * @since 2.2.0 | 
| 2655 |  * @uses add_action() Calls '_admin_menu' hook with 'wp_widgets_add_menu' value. | 
| 2656 |  */ | 
| 2657 | function wp_maybe_load_widgets() { | 
| 2658 |      if ( ! apply_filters('load_default_widgets', true) ) | 
| 2659 |           return; | 
| 2660 |      require_once( ABSPATH . WPINC . '/default-widgets.php' ); | 
| 2661 |      add_action( '_admin_menu', 'wp_widgets_add_menu' ); | 
| 2662 | } | 
| 2663 |  | 
| 2664 | /** | 
| 2665 |  * Append the Widgets menu to the themes main menu. | 
| 2666 |  * | 
| 2667 |  * @since 2.2.0 |