# Constant

A **constant** is something that does not change. Constants (numbers) are used in maths and computer programming.

An important fact to remember in calculus is that the derivative of a constant is always zero.

Not to be confused with Mathematical constant or Physical constant.

A **constant** is something that does not change. Constants (numbers) are used in maths and computer programming.

An important fact to remember in calculus is that the derivative of a constant is always zero.

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