A publicity stunt is when someone does something on purpose to get attention from other people. Sometimes they do it to make themselves more famous or to get people to talk about them. For example, if a celebrity jumps out of an airplane with a big banner that has their name on it, it might be a publicity stunt. This way, lots of people will see them and talk about them, even if they didn't do anything important or special. People sometimes use publicity stunts to try to get more customers for their business or to raise money for a good cause. It's kind of like when you put on a show for your family or friends to get their attention and make them laugh or clap for you!