A boy band in this year's (2010) X-Factor, put together by Simon Cowell. It consists of Liam Payne, Harry Styles, Zayn Malik, Louis Tomlinson, Niall Horan. Each of them have their own dedicated fan groups who often argue about which band member is the best. Hugely popular with teenage girls across Britain, they are like the second-coming of JLS but generally better looking and younger.
An infaturation with this band is termed 'One Direction Infection'.
Leila: Who are you voting for tthis Saturday on X-Factor?
Francesca: One Direction of course! ZOMG I love Liam Payne sooo much!
Leila: no, Harry Styles is definitely the best.
*random third girl*: no way, Zayn Malik is the one for me *swoons*.