What does Function mean in math?

In mathematics, a function is a relation that assigns each input exactly one output. It is typically expressed as ( f(x) ), where ( x ) is the input variable and ( f(x) ) is the output. Functions can be represented in various forms, including equations, graphs, and tables, and they are fundamental in describing relationships and changes between quantities. The concept of a function is crucial in various fields, including calculus, algebra, and statistics.