What part of the beef is used for hamburger?

The part of the beef used for hamburger is typically ground beef, which is made from trimmings from various cuts of beef, such as chuck, round, and sirloin. These trimmings are then ground together to create a mixture of different cuts of beef. Sometimes, other parts of the beef, such as brisket, flank, or short rib, may also be used to make hamburger.