This document provides definitions and background information on various textile terms. It begins with an introduction to textiles and defines key terms like fiber, filament, yarn and fabric. It then discusses the history of natural fibers like cotton, wool and silk. The document also summarizes the development of various man-made fibers like rayon, nylon, acrylic and polyester. It provides timelines of when these fibers were first invented and commercialized. The document is intended to serve as a reference for textile engineering students.