What is different between do_action vs add_action vs remove action in wordpress ?

 

What is do_action in wordpress?

Description  1.

do_action creates the hook for things to hang. This is at the core of WordPress and even frameworks like Genesis and many other themes and plugins. do_action is the first domino in the chain of events with hooks. However, alone, it means nothing and does nothing. Simply, it tells WordPress to search to see if any functions are attached to it to fire. 

Credit : https://wpsmith.net/2011/the-difference-between-do_action-add_action-and-add_filter/

Description  2.

his function invokes all functions attached to action hook $tag. It is possible to create new action hooks by simply calling this function, specifying the name of the new hook using the $tag parameter

Credit : https://developer.wordpress.org/reference/functions/do_action/

Description  3.

Use do_action( 'unique_name' ) to create your own actions.

You can use that to offer an API for your plugin, so other plugins can register callbacks for your custom action.

 

add_action() and do_action() are not necessary tied together.

 

Great Reference link  for do_action

https://wordpress.stackexchange.com/questions/120339/difference-between-do-action-and-add-action

https://wordpress.stackexchange.com/questions/64677/do-i-need-to-call-do-action-in-my-plugin/64678#64678