The zodiac is an imaginary band in the sky. The cons tellations of stars that lie along band are known as the constellations of the zodiac.
If you look up into the sky on aclera night, you will see millions of stars. If you look more closely, you will see how some stars make patterns and pictures. Tthese are called constellations. A constellation that is easy to find is the Little Dipper (Ursa Minor)