Unity is a cross-platform game development engine created by Unity Technologies. It allows developers to create both 2D and 3D games and interactive experiences for various platforms, including consoles, computers, and mobile devices. Unity provides a user-friendly interface and a robust set of tools, making it accessible for beginners and experienced developers alike. One of Unity's key features is its asset store, where developers can buy and sell game assets, such as graphics, sound effects, and scripts. This marketplace helps streamline the development process by providing ready-made resources, allowing creators to focus on building their unique games and experiences.