This document provides an overview of optical fiber communication. It begins with introducing optical fibers and how they guide light through total internal reflection. It then describes the different types of optical fibers, including step index and graded index fibers. The key elements of an optical fiber communication system are presented, along with the benefits such as high bandwidth, low loss, and electrical isolation. Applications include telecommunications networks, computing, and military systems. In conclusion, while optical fibers have some disadvantages, they have revolutionized communications due to their wide bandwidth and low transmission losses.