One Direction, a British-Irish boy band formed on 'The X Factor' in 2010, quickly rose to fame with their debut album 'Up All Night' and hits like 'What Makes You Beautiful.' Despite the departure of member Zayn Malik in 2015, the remaining members continued to release successful albums and eventually announced a hiatus in 2016 to pursue solo careers. As of 2021, while they hinted at a possible reunion, One Direction's legacy as one of pop music's most iconic boy bands remains strong.