The UEFA Champions League (UCL) is Europe's most prestigious and widely-watched club football competition, contested annually by top-division teams across the continent. Established in 1955 as the European Cup, it initially featured domestic champions in a straight knockout format. The tournament underwent a significant transformation, adopting its current name in 1992 and introducing a round-robin group stage along with allowing multiple entrants from strong leagues. Its current format includes a league phase, thrilling double-legged knockout rounds, and a single-leg final. Real Madrid holds the record as the most successful club with an impressive 15 titles, including winning the first five editions, while Paris Saint-Germain are the current champions, securing their first-ever title in the 2025 final.