Real Sociedad was founded in 1909, making it one of the oldest football clubs in Spain, while Barcelona was founded in 1899.
Real Sociedad has won the La Liga title twice, while Barcelona has won it a record 26 times.
Real Sociedad's home stadium is the Anoeta Stadium, which has a capacity of around 39,500, while Barcelona's home stadium is the Camp Nou, which is the largest football stadium in Europe with a capacity of over 99,000.
Real Sociedad's current team captain is Asier Illarramendi, while Barcelona's current team captain is Lionel Messi.
Real Sociedad is known for its emphasis on developing young talent through its youth academy, while Barcelona is famous for its association with the philosophy of "tiki-taka" and its historic rivalry with Real Madrid.