This document provides an overview of captioning basics, benefits, accessibility laws and lawsuits, captioning services and tools. It summarizes key terminology related to captions, different caption formats, how captions are associated with video, and the benefits of captions for accessibility, comprehension, flexibility, searchability, SEO, reusability and translation. It outlines some major accessibility laws and recent lawsuits related to closed captioning on Netflix and in higher education. The document also introduces 3Play Media as a company that provides captioning, transcription and translation services, and summarizes some of their goals, processes, integrations, formats, tools and customer support.