Final answer:
A function is a mathematical concept that describes a relationship between a set of inputs and a set of outputs.
Step-by-step explanation:
A function is a mathematical concept that describes a relationship between a set of inputs and a set of outputs. In a function, every input has exactly one output. This means that for each value you input into a function, you will always get a specific output.
For example, if we have a function f(x) = 2x, we can input any value for x and the function will output the result of multiplying that value by 2. So if we input x = 3, the function will output 2 * 3 = 6.