# Creating UI in Unity There are two locations where UI interactions can happen: - Screen Space This UI can be compared with the UI of a normal mobile application. All widgets will be drawn ontop of the 3D world. For smartphone AR applications this is the most usefull. - API Documentation: https://docs.unity3d.com/2021.3/Documentation/Manual/UIElements.html - UI Builder Documentation: https://docs.unity3d.com/Packages/com.unity.ui.builder@1.0/manual/index.html - Video Tutorial: https://www.youtube.com/watch?v=8w0qvO4Vumc - Get started with UI Builder: https://www.youtube.com/watch?v=NQYHIH0BJbs - Installing the UI Toolkit package: You install the UI Toolkit package from the package manager: * Click Add (+) * From the menu, choose Add package from git URL… * In the text field, type **com.unity.ui** * Click Add ![](https://i.imgur.com/1XcL8d6.png) - World Space This UI is used when the UI is a 3D object itself. All widgets are objects in the 3D world. This UI type of interaction is most usefull in Mixed Reality (hollolens) and/or VR. - Documentation: https://docs.unity3d.com/2021.3/Documentation/Manual/UICanvas.html - Video Tutorial: https://www.youtube.com/watch?v=GuWEXBeHEy8 ![](https://i.imgur.com/li6wowJ.png)