Swansea City Association Football Club (Welsh: Clwb Pêl-droed Dinas Abertawe) are a Welsh professional football club based in Swansea, Wales. Formed in 1912 they joined the Football League in 1921, and have been members ever since. They played in the old Football League First Division between 1981 and 1983, finishing sixth in their first season. In 2010–11 they were promoted to the Premier League, after winning the Football League Championship play-offs, and will become the first Welsh club to play in the division. They are also the 45th team to play in the competition since its inception in 1992.
The club was known as Swansea Town until 1969, when it adopted the name Swansea City to reflect Swansea's new status as a city.[1]
Since 2005 Swansea City have played their home games at the Liberty Stadium, a ground they share with the Ospreys Rugby Union Club. Before 2005 the club's home ground was Vetch Field.
Swansea City and its supporters are unofficially known as 'Jacks'. One explanation for this name is that during the 17th century, sailors from Swansea were respected and any 'Swansea Jack' was allowed to join the crew based simply on the town's reputation for good sailors. Many, however, believe that the name originates from the renowned life-saving dog Swansea Jack.
Source : Wikipedia.com