Domain of a Function 1 - Machine Analogy

Relating a mathematical function to how a machine works can paint a different picture in order to understand how functions work in math. When working with a machine, you insert an input, and the result after the machine's work is some sort of output. Like so, we have independent values and dependent values in a math function.

A domain can be considered any input that is acceptable by the machine, in other words independent values that will render a definable output.

Excuse my grammar. I was nervous explaining to the camera xD