Artificial Intelligence (AI) is intelligence demonstrated by machines, unlike the natural intelligence displayed by humans and animals.
AI is defined in the field as the study of "intelligent agents": that is any device that perceives its environment and takes actions that maximize its chance of successfully achieving its goals. AI machines (or computers) will mimic "cognitive" functions that humans associate with the human mind, such as "learning" and "problem solving".
Data science is an inter-disciplinary field that uses scientific methods, processes, algorithms and systems to extract knowledge and insights from many structural and unstructured data. DS is related to data mining, deep learning and big data.
DS is a "concept to unify statistics, data analysis, machine learning, domain knowledge and their related methods" in order to "understand and analyze actual phenomena" with data. It uses techniques and theories drawn from many fields within the context of mathematics, statistics, computer science, domain knowledge and information science.