M33, also known as the Triangulum Galaxy, is a spiral galaxy located about 2.73 million light-years from Earth. It is the third-largest member of the Local Group, which includes the Milky Way and the Andromeda Galaxy. M33 is notable for its relatively low surface brightness and is often studied for its star formation activity. The galaxy spans approximately 60,000 light-years in diameter and contains several regions of active star formation, including the well-known NGC 604. M33 is visible to the naked eye under dark skies and is best observed with binoculars or small telescopes, making it a popular target for amateur astronomers.