Physical comedy focuses on manipulation of the body or character for a humorous affect. It can include slapstick, clowning, mime, physical stunts, or idiosyncratic character traits. Explaining all comedy usually makes things less funny-- it depends so much on context and character, so I'll stop here.
Read John Towsen's blog or google any of these names:
Rowan Atkinson, Lucille Ball, Mel Brooks, Carol Burnett, Steve Carell, Jackie Chan, Charlie Chaplin,  Jim Carrey, John Cleese, Chevy Chase, Tim Conway, Dick Van Dyke, Chris Farley, Will Ferrell, Benny Hill, Buster Keaton, Don Knotts, Jerry Lewis, Harold Lloyd, Eddie Murphy, Bill Murray, Mike Myers, Leslie Nielsen, Richard Pryor, Michael Richards, John Ritter, Martin Short, Ben Stiller, Jim Varney, Gene Wilder, Robin Williams, and groups like: Laurel and Hardy, The Marx Brothers, Andy Dwyer.