TopCoder is an online competitive programming platform that connects developers and designers from around the world. It offers various challenges in coding, algorithm design, and software development, allowing participants to showcase their skills and earn rewards. Founded in 2001, TopCoder has become a popular hub for tech enthusiasts, hosting contests that range from simple coding tasks to complex problem-solving challenges. The platform also provides a community for learning and collaboration, making it a valuable resource for both beginners and experienced professionals in the tech industry.