This document provides an overview of composite materials, including their definition, constituents, terminology, classification, characteristics, and applications. Key points include: - Composite materials are composed of a reinforcement phase (e.g. fibers) within a binder phase (e.g. matrix). They offer advantages like high strength and stiffness with low weight. - Constituents include fibers, matrix, fillers, and coupling agents. Fiber materials include glass, carbon, and Kevlar. Matrix materials include metal, polymer, and ceramic. - Composites find applications in aerospace, automotive, marine, sports, infrastructure, and medical due to their tailorable properties and corrosion resistance.