A JavaScript Cheat Sheet is a concise, easy-to-reference guide that highlights key JavaScript syntax, methods, functions, and concepts for developers. It typically includes common commands, operators, and code snippets for performing tasks like manipulating arrays, working with objects, handling events, and implementing control flow structures. Designed to provide quick access to essential information, a cheat sheet helps developers save time by offering simplified explanations of complex JavaScript features, such as closures, promises, and asynchronous programming, making it a valuable tool for both beginners and experienced programmers.