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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 | 
|---|---|
| 833 |      function start_el(&$output, $category, $depth, $args) { | 
| 834 |           extract($args); | 
| 835 |  | 
| 836 |           $cat_name = esc_attr( $category->name ); | 
| 837 |           $cat_name = apply_filters( 'list_cats', $cat_name, $category ); | 
| 838 |           $link = '<a href="' . esc_attr( get_term_link($category) ) . '" '; | 
| 839 |           if ( $use_desc_for_title == 0 || empty($category->description) ) | 
| 840 |                $link .= 'title="' . esc_attr( sprintf(__( 'View all posts filed under %s' ), $cat_name) ) . '"'; | 
| 841 |           else | 
| 842 |                $link .= 'title="' . esc_attr( strip_tags( apply_filters( 'category_description', $category->description, $category ) ) ) . '"'; | 
| 843 |           $link .= '>'; | 
| 844 |           $link .= $cat_name . '</a>'; | 
| 845 |  | 
| 846 |           if ( !empty($feed_image) || !empty($feed) ) { | 
| 847 |                $link .= ' '; | 
| 848 |  | 
| 849 |                if ( empty($feed_image) ) | 
| 850 |                     $link .= '('; | 
| 851 |  |