Overview
A gimmick is a novel device or idea designed primarily to attract attention or increase appeal, often with little intrinsic value. When applied to retail marketing, it is a unique or quirky feature designed to make a product or service "stand out" from its competitors. Product gimmicks are sometimes considered mere novelties, and tangential to the product's functioning. Gimmicks are occasionally viewed negatively, but some seemingly trivial gimmicks of the past have evolved into useful, permanent features. In video games, the term is also sometimes used to describe unusual features or playstyles, especially if they are unnecessary or obnoxious.
Etymology
The origin of the term "gimmick" is uncertain. Etymologists suggest that the term emerged in the United States in the early 20th century. The Oxford Dictionary suggests that it may have originally been a slang term for something that a con artist or magician manipulated to make appearances different from reality, and which gradually changed its meaning to refer to any ‘piece of magicians' apparatus’. The word itself may be an approximate anagram of the word magic.
The term gimmick may also have resulted from alteration to the word gimcrack, which refers to a showy object of little use or value. Another possible origin is that it may have come into use among gaming tables, where it came to refer to "a device used for making a fair game crooked". The term first appeared in American newspapers in the 1910s and 1920s.
From Wikipedia (CC BY-SA 4.0).