User Interface (UI)

UI Toolkit (Recommended)

UI Toolkit can create both Runtime and Editor UI.

Unity UI	Immediate Mode GUI
a.k.a. uGUI	a.k.a. IMGUI
a runtime-only UI system	a editor-only UI system
uGUI is a GameObject-based UI system that uses Components and the Game View to arrange, position, and style user interfaces.	IMGUI is a code-driven GUI system, and is driven by calls to the OnGUI() function on any script which implements it.