The "Old Firm" refers to the long-standing rivalry between two Scottish football clubs, Celtic FC and Rangers FC. Both clubs are based in Glasgow and have a rich history, with Celtic founded in 1887 and Rangers in 1872. The matches between these teams are highly anticipated events in Scottish football, drawing large crowds and intense emotions from fans. This rivalry is not just about football; it also has cultural and religious dimensions. Celtic is traditionally associated with the Catholic community, while Rangers has ties to the Protestant community. This backdrop adds depth to the rivalry, making it one of the most famous in the world.