AlphaGo is an artificial intelligence program developed by DeepMind, a subsidiary of Google. It was designed to play the ancient board game Go, which is known for its complexity and strategic depth. In 2016, AlphaGo made headlines by defeating the world champion, Lee Sedol, marking a significant milestone in AI development. The program uses a combination of machine learning and neural networks to evaluate board positions and make decisions. AlphaGo's success demonstrated the potential of AI in mastering complex tasks, paving the way for advancements in various fields, including healthcare and robotics.