Unity is a game engine/platform that allows game developers to quickly create exciting content without a steep learning curve. I therefore recommend Unity to my students as a great way of getting into game development while also learning how to code in C#.
Here is a simple example with a downloaded model spinning in space that has been compiled to run in WebGL and thereby can be viewed in a browser. Unfortunately, WebGL is not supported by mobile phones and tablets which somewhat reduces the range of useful applications. Hopefully this will be solved as more powerful and flexible mobile platforms arrive.