Artificial Intelligence (AI) is a field which uses computer science to enable problem-solving. It also involves machine learning and deep learning, which are frequently mentioned in conjunction with artificial intelligence. This however, is in contrast to human intelligence, which is natural intelligence.
AI is a system that has been built by man mimicking human intelligence. AI understands language, thinks and responds intelligently, just as humans do. Intelligence that has been a preserve to humans has now been programmed into computer software(s).
When building an AI system that can understand language, you must give it a set of instructions for that language and program them into Machine learning, which is a branch of intelligence and computer science that focuses on the use of data and algorithms, to imitate the way that humans learn, gradually improving its accuracy. This way, the AI tool is able to learn on its own how to understand the language in question.