A wafer is a thin, flat piece of material that is usually made from a solid substance. It can be circular or square in shape and is often used for various purposes such as in electronics, food production, and photography. In the context of semiconductor manufacturing, wafers are commonly used to create integrated circuits, where a thin layer of material is deposited onto a wafer made from silicon or another suitable substrate. The finished circuit is then separated into individual chips that can be incorporated into electronic devices such as computers and smartphones. In the food industry, wafers are often used to refer to thin, crisp cookies or crackers that are typically round in shape.