Rationality refers to the quality of being reasonable and logical in thinking and decision-making. It involves using evidence and reasoning to arrive at conclusions, rather than relying on emotions or assumptions. Rational individuals weigh the pros and cons of a situation, considering the available information to make informed choices. In philosophy and psychology, rationality is often contrasted with irrationality, which involves illogical or emotional responses. The study of rationality can be found in various fields, including economics, where it helps explain how people make choices under uncertainty, and in cognitive science, which explores how the mind processes information.