Before starting out with the Unity Editor, you might want to familiarize yourself with the platforms that you can create your projects in. Unity supports most of the leading desktop, web, and mobile platforms as follows:
Note: If you are a developer with access to Closed platforms, you may see more platform options when you download and register your preferred platform setup. For further information, see Platform Module Installation. and Unity forums.
For a full list of platforms that Unity supports as well as the system requirements for these platforms, see documentation on System Requirements.