A wafer is a thin, crisp, flat piece of food, often sweet and delicate. Think of the crunchy layers in an ice cream sandwich, or the light, honeycomb-patterned cookies that come with some desserts. Wafers are baked until they become dry and brittle, snapping easily when you bite them.

The word comes from baking, where thin batters are cooked between hot plates to create these crispy sheets. Vanilla wafers are a classic snack cookie, round and golden. Wafer cookies often get layered with cream or chocolate to make treats like wafer bars.

In electronics, a wafer means something completely different: a thin, round slice of ultra-pure silicon used to make computer chips. Engineers etch millions of tiny circuits onto these silicon wafers, then cut them into individual chips that power everything from phones to cars. These wafers look like shiny gray mirrors and are manufactured in spotlessly clean rooms where even a speck of dust could ruin the delicate circuits.

In church services, a wafer also refers to the thin, round piece of unleavened bread used in communion. Whether in baking, technology, or religious practice, the word captures that sense of something remarkably thin and carefully made.