Bust of Socrates. Roman copy of an original thought to be carved by Lysippos.

Philosophy is the study of the reasons for things. It also tries to understand how things should be. "Philosophia" is the Ancient Greek word for the "love of wisdom". A person who works in the field of philosophy is called a philosopher. A philosopher is a kind of thinker and researcher. A "philosophy" can also mean a group of ideas or way of living suggested by philosophers. Philosophy is a way of thinking about the world, the universe, and society. In the past, natural sciences were a part of philosophy.