The Repeat Action allows you to repeat a sequence of sub-actions as many times as you like.
It is one of several Actions that loop through a set of other Actions until some criteria is met.
The repeat count can be a simple number, or you can use a variable or other calculation in the field (as with most all numeric fields in Keyboard Maestro, simply start typing and the field will expand to make room for more than a number).
You can break out of the loop, retry this iteration, or skip to the next iteration with the Redirect Control Flow actions.
There is an option in the action (gear) ⚙ menu to display the progress as the action executes (v11.0+).