Unity is a cross-platform game engine developed by Unity Technologies that is commonly used to create video games, simulations, and other interactive experiences. It allows developers to create 2D and 3D content, ranging from simple mobile games to complex virtual reality applications. Unity has a user-friendly interface and powerful tools for creating and importing assets, scripting behaviors, and optimizing performance. It also supports a wide range of platforms, including mobile devices, consoles, and computers, making it a popular choice for developers looking to reach a broad audience. Unity has a large and active community of developers who share resources, collaborate on projects, and provide support for one another.