Discrete Domain

A function is said to have a discrete domain when the independent variable of the function is a discrete quantity. A function of this type can be identified by its graph, which is composed of any number of unconnected points. Consider the function that models the costs of concert tickets, specifically for 0, 1, 2, 3, and 4 tickets.

The domain of this function is the set of integers from 0 to 4, indicating that the function has a discrete domain.