A signed baseball is a baseball that has been autographed by a player, coach, or other notable figure in the sport of baseball. These signatures can add significant value to the ball, especially if the signer is a famous player or if the ball is associated with a memorable event, such as a championship game. Collectors often seek signed baseballs as part of their memorabilia collections. The authenticity of the signature is crucial, and many collectors prefer balls that come with a certificate of authenticity from reputable sources. Signed baseballs can be displayed in cases or used as gifts for fans of the sport.