Chelsea Football Club is a professional football club based in London, England. The club was founded in 1905 and has played its home matches at Stamford Bridge since its formation.

In the early years of the club, Chelsea enjoyed moderate success, winning their first major trophy, the League Championship, in 1955. However, the club struggled for consistency throughout much of the 1960s and 1970s.

It was not until the arrival of Russian billionaire Roman Abramovich in 2003 that Chelsea truly emerged as one of the dominant forces in English football. Under the ownership of Abramovich, Chelsea has won multiple Premier League titles, FA Cups, and European trophies, including the UEFA Champions League in 2012.

The club has also been home to many legendary players, including Didier Drogba, Frank Lampard, John Terry, and Petr Cech, among others.

In addition to its success on the field, Chelsea has been involved in a number of significant off-field events, including becoming the first English club to field an entirely foreign starting lineup in 1999 and being the first club to field a Premier League team with an average age under 20 in 2021.

Today, Chelsea remains one of the most successful and popular football clubs in the world, with a passionate fanbase and a commitment to success both on and off the field.