What is cascade, in ->onDelete('cascade')?

Question

SQL

There is an example in the doc:

$table->foreign('user_id')
      ->references('id')->on('users')
      ->onDelete('cascade');

What is 'cascade'? Through ctrl (in phpstorm) having fallen into the description, I understand that this is some kind of action.
What is this action? What other actions are there (I would be grateful for a link to the list of actions in the dock)?

Answer 1

https://dev.mysql.com/doc/refman/8.0/en/create-tab...