The Unity Scripting Reference is the official central hub of documentation and information for the scripting API that Unity provides. The scripting API is basically a library with specifications (explanations) for the classes and functions of those classes.
The following screenshot shows the Unity Scripting Reference page on the official Unity website:
To access the Unity Scripting Reference, we visit the following URL:
https://docs.unity3d.com/Documentation/ScriptReference/index.html
UnityScript is also simply called JavaScript by the Unity community and Unity documentation. Within the Unity Scripting Reference, we can search for any terms that we would like to use in our game using the search box, and we can even select the language we would like, as shown in the following screenshot:
The Unity Scripting Reference is very useful and helpful as it also provides snippets of script, as shown in the following screenshot: