RoboCup is the world's largest robotics competition, founded in 1997 with the long-term goal of fielding a team of autonomous humanoid robots capable of defeating the FIFA World Cup champions by 2050. Organised annually by the RoboCup Federation, it draws more than 400 teams from 45 countries and spans eleven distinct leagues covering robot soccer, rescue operations, domestic service robots, industrial logistics, and simulation environments. The Standard Platform League requires all teams to use identical NAO robots, making software and AI the only differentiator. The Humanoid League uses custom-built bipedal robots competing in adult, teen, and kid size categories. The Home League tests domestic robots on real-world household tasks including object recognition, human interaction, and navigation. RoboCup is the most cited benchmark competition in academic robotics research, with participating teams publishing world-leading papers on locomotion, computer vision, and multi-agent coordination annually.