Abbott and Costello was a famous American comedy duo consisting of Bud Abbott and Lou Costello. They gained popularity in the 1940s and 1950s through their radio shows, television appearances, and films. Their comedic style often featured witty wordplay, misunderstandings, and humorous routines, with one member typically playing the straight man to the other's silly antics. One of their most iconic routines is "Who's on First?", which showcases their unique ability to create confusion through clever dialogue. The duo's influence on comedy is significant, and they remain beloved figures in American entertainment history, inspiring many comedians who followed them.