Unity WebGL is a platform for creating browser-based games using the Unity game engine. It allows developers to create high-quality 3D and 2D games that can be played directly in a web browser without the need for additional software or plugins. Unity WebGL games offer a seamless gaming experience with smooth graphics and responsive controls, making them a popular choice for both casual and hardcore gamers. Additionally, Unity WebGL games can be easily shared and played across a wide range of devices, including desktop computers, laptops, and mobile devices.