What are bulk actions?
Bulk actions or bulk editing is an efficient way to complete certain actions to multiple sections at one time as opposed to completing the same action multiple times. For example, you can perform a bulk action to: Enable multiple users at the same time. Add multiple users to the same group.
What is bulk action in WordPress?
Bulk actions – is a part of WordPress admin interface, that allows you to select multiple elements like posts, terms, users and perform any action to all of them. It is very handy because for example it allows you to remove let's say hundreds of posts in just three clicks and saves you tons of time.