Dublin is both the largest city and capital of Ireland. It is officially known in Irish as Baile Átha Cliath or Áth Cliath; the English name comes from the Irish Dubh Linn meaning "black pool". It is located near the midpoint of Ireland's east coast, at the mouth of the River Liffey and at the centre of the Dublin Region. Originally founded as a Viking settlement, it evolved into the Kingdom of Dublin and became the island's primary city following the Norman invasion. Today, it is ranked 10th (up from 13th in 2008) in the Global Financial Centres Index, has one of the fastest growing populations of any European capital city, and is listed by the GaWC as a global city, with a ranking of Alpha - which places Dublin amongst the top 25 cities in the world . Dublin is a historical and contemporary cultural centre for the island of Ireland as well as a modern centre of education, the arts, administrative function, economy and industry.

There is a vibrant nightlife in Dublin and it is reputedly one of the most youthful cities in Europe - with estimates of 50% of inhabitants being younger than 25.Furthermore in 2007, and again in 2009, Dublin was voted the friendliest city in Europe. Like the rest of Ireland, there are pubs right across the city centre. The area around St. Stephen's Green - especially Harcourt Street, Camden Street, Wexford Street and Leeson Street - is a centre for some of the most popular nightclubs and pubs in Dublin.The internationally best-known area for nightlife is the Temple Bar area just south of the River Liffey. To some extent, the area has become a hot spot for tourists, including stag and hen parties from Britain. It was developed as Dublin's cultural quarter (an idea proposed by local politician Charlie Haughey), and does retain this spirit as a centre for small arts productions, photographic and artists' studios, and in the form of street performers and intimate small music venues.

Live music is popularly played on streets and at venues throughout Dublin in general and the city has produced several musicians and groups of international success, including U2, The Dubliners, Horslips, The Boomtown Rats, Thin Lizzy, Sinéad O'Connor, The Script and My Bloody Valentine. The two best known cinemas in the city centre are the Savoy Cinema and the Cineworld Cinema, both north of the Liffey. Alternative and special-interest cinema can be found in the Irish Film Institute in Temple Bar, in the Screen Cinema on d'Olier Street and in the Lighthouse Cinema in Smithfield. Across suburban Dublin are located large modern multiscreen cinemas. Situated on the Liffey at the Eastlink tollbridge, The O2, Dublin (originally called, and still often known as, the Point Theatre) has housed world renowned performers in all fields of music.