A wafer is a thin slice of Semiconductor material, such as a Silicon crystal, used in the fabrication of integrated circuit and other microdevices.
Glossary
Wafer and Semiconductor Fabrication Plants
A Wafer Fabrication Plant prepares slices (‘wafers’) of pure, defect-free materials for use in semiconductor manufacturing. A Semiconductor Fabrication Plant (also known as a semifab or just fab) uses specialized machinery to etch and layer material on a wafer to create integrated circuits – usually tens or hundreds of integrated circuits per wafer.