## Constant

### A term that does not contain a variable.

A constant is a value in a program that does not change during the execution of the program. This means that its value is fixed and cannot be modified by any instruction or operation once it has been defined.

Constants are typically used to define values that are universal or well-known, such as mathematical constants like pi (3.14) or the golden ratio (1.618). They are also used to define values that remain unchanged throughout the execution of a program, such as the size of an array or the maximum number of iterations in a loop.

In most programming languages, constants are defined using the ‘const’ keyword followed by the name of the constant and its value. For example, in C++:

const int MAX_ITERATIONS = 100;

This creates a constant named ‘MAX_ITERATIONS’ with a value of 100.

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