The term "Mod" has multiple meanings depending on its context.
1) In fashion, "Mod" refers to a style that emerged in London in the early 1960s characterized by young men and women wearing tailored suits, slim-fitting trousers, high heels, and bold patterns such as polka dots or paisley.
2) In music, "Mod" refers to a subculture that emerged in the UK in the 1960s characterized by a love of soul music, amphetamines, and fashionable clothing. The term is short for modernist and was used to describe a group of people who were interested in modern art, literature, and design.
3) In computing, "Mod" can refer to an modification or alteration made to a game or software program by users in order to change or enhance its features.