This document provides an introduction to afterburners, including their components and design requirements. It discusses how afterburners work to augment thrust by injecting additional fuel downstream of the turbine. Key components include a diffuser, fuel injection system, igniter, flame holders, cooling liners, and variable area nozzle. The document describes the purpose and functioning of each component. It also outlines specific design goals for afterburners such as high temperature rise, low losses, wide temperature modulation capability, and avoidance of combustion instabilities.