Cosmo Kramer is a fictional character from the television sitcom Seinfeld, which aired from 1989 to 1998. Portrayed by actor Michael Richards, Kramer is known for his eccentric personality, wild hair, and unique fashion sense. He often bursts into scenes with high energy and has a knack for getting into unusual situations. Kramer is Jerry Seinfeld's neighbor and best friend, frequently offering quirky advice and schemes. His character is characterized by a carefree attitude and a lack of conventional boundaries, making him a memorable and beloved figure in television history.