For many actors, it's the highpoint of the night – hundreds of people clapping, the satisfaction of a play gone well, the relief knowing you're one step closer to heading to bed. For the audience, it's a chance to see the actor break out of the character, smile, and thank their spectators.
So we've created a cheeky quiz to see whether or not you can identify the performer by their bows? You'll have to write in the star's name yourselves, so make sure you get the spelling right!
Then let us know how well you get on via Facebook and Twitter.