This document provides an overview of composite materials, including definitions, key components, types of composites, and applications. It defines a composite as a material made from two or more constituent materials combined to give unique properties. Composites consist of a reinforcement material, such as fibers, and a matrix that holds the reinforcements together. The document describes different types of reinforcements, matrices, and the roles they play in composites. It also outlines various composite material types and their applications in industries such as aerospace, automotive, marine, and consumer goods.