A constellation is a group of stars that make a pattern in the sky, like a dot-to-dot picture. Some constellations look like an animal, an object or a person. There are 88 of them.
People throughout history have used the constellations to help them find their way, like a map. Some of the earliest recordings date back to the Ancient Greeks, who knew they could sail in a certain direction by watching the position of the stars in the night sky. People also used to use the position of the constellations to create calendars.