Require means to need. You require food, water, and shelter to live, but do you really require that new pair of high-fashion shoes?
The verb require comes from Latin root words re, meaning repeatedly, and quaerere meaning to ask. The word lost the sense of asking and came to mean needing, demanding or insisting upon something. The law requires that you attend school until you're sixteen; your parents probably require you to finish high school. If you're a waiter in a fancy restaurant and the food has been served, as if your customers require anything else.