Unity is a tool for creating interactive 3D content like games and visualizations that can be deployed to desktops, consoles, and mobile devices. The workflow involves importing 3D assets, adding properties, tweaking in the Unity editor, creating prefabs, and building scenes. Scripting uses the .NET-based Mono framework with languages like C#, JavaScript, and Boo. Unity has both free and pro license options, with pro features including pathfinding, crowd simulation, and profiling tools. Popular games made with Unity include Bad Piggies, The Room, and Temple Run 2.