This article traces the development of Artificial Intelligence (AI) from its beginnings in the mid-20th century to the present day. It begins with the Dartmouth Conference in 1956, which marked the official birth of AI, and follows the development of AI through the logic-based approach of the 1960s, the rise of expert systems in the 1970s and 1980s, and the emergence of machine learning in the late 1980s. It highlights the successes and limitations of each approach and how they have shaped the AI landscape today.