A philosopher is a person who engages in the study of philosophy, which is a systematic study of general and fundamental questions concerning topics like existence, reason, knowledge, value, mind, and language. Philosophers offer views or theories on profound questions in ethics, metaphysics, logic, and other related fields. They seek to understand fundamental truths about themselves, the world in which they live, and their relationships to the world and to each other. Philosophers use a great variety of methods to arrive at philosophical knowledge, including conceptual analysis, reliance on common sense and intuitions, use of thought experiments, analysis of ordinary language, description of experience, and critical questioning. They employ logic to study the nature and structure of arguments and ask questions such as what constitutes "good" or "bad" reasoning and how to determine whether a given piece of reasoning is good or bad. Philosophers also study the history of philosophy to explore the ideas of historical figures such as Plato, Aristotle, Descartes, and Kant. In summary, a philosopher is someone who seeks wisdom and engages in the study of philosophy to understand fundamental truths about the world and themselves.