One Direction, often shortened to 1D, are an English-Irish pop boy band formed in London in 2010. The group is composed of Niall Horan, Liam Payne, Harry Styles, Louis Tomlinson, and previously Zayn Malik until his departure from the group in March 2015. They became one of the best-selling boy groups of all time before going on an indefinite hiatus in 2016.

A boy band is loosely defined as a vocal group consisting of young male singers, usually in their teenage years or in their twenties at the time of formation. Generally, boy bands perform love songs marketed towards girls and young women. Many boy bands dance as well as sing, usually giving highly choreographed performances. South Korean boy bands usually also have designated rappers.