AI refers to technology that simulates human intelligence to perform tasks like decision-making and problem-solving. It is used in various applications such as recommendation systems, chatbots, messaging and more. The concept of AI dates back to ancient myths, but modern AI began in the 1940s and 50s with pioneers like Alan Turing. Although AI has achieved significant breakthroughs, including machine learning, it also brings ethical concerns such as job displacement and security risks.