The term Sitcom is a portmanteau of "Situation Comedy". Originally, sitcoms were broadcast on the radio. Before long, they progressed to television; the Ur-Sitcom on TV is I Love Lucy
, which pioneered many of the technical and comedic techniques used to this day, including Three Cameras
, but the first television sitcom is generally agreed to have been 1946's Pinwright's Progress
on The BBC
(all footage is lost, however).
See also Comedy Tropes