What is a belief?

A position or concept that is considered to be true but often lacking proof; an opinion based on assumptions instead of proof.
What is a hypothesis?

A possible solution to a problem or possible answer to a scientific question based on prior knowledge and reasoned logic.
What is a theory?

An explanation of a set of related observations or events based upon proven hypotheses and verified multiple times; accepted as proven truth.
What is a law?

A statement of fact meant to explain an action often expressed by mathematical equations; accepted as fact because they have always been observed to be true.