Abbot and Costello was a popular American comedy duo consisting of Bud Abbott and Lou Costello. They gained fame in the 1940s and 1950s through their radio shows, television appearances, and films. Their comedic style often featured witty wordplay, misunderstandings, and slapstick humor, making them a beloved act in American entertainment. The duo is best known for their iconic routine "Who's on First?" which showcases their unique ability to create humor through confusion and clever dialogue. Their influence on comedy has endured, inspiring many comedians and entertainers in the years since their peak popularity.