Laugh tracks became a staple of television comedy from the 1950s onward, when producers added recorded audience laughter to sitcoms to recreate the feeling of watching a show with a live crowd. The technique spread through decades of US sitcoms and later became a familiar shorthand in online comedy, where a short burst of laughter can instantly frame a clip as a joke. Today creators reuse these brief tracks in memes, edits and reaction videos because the sound is instantly recognisable and needs no explanation.