Scripting (or creating scripts) is writing your own additions to the Unity Editor’s functionality in code, using the Unity Scripting API.
When you create a script and attach it to a GameObject, the script appears in the GameObject’s Inspector just like a built-in component. This is because scripts become components when you save them in your project.
In technical terms, any script you make compiles as a type of component, so the Unity Editor treats your script like a built-in component. You define the members of the script to be exposed in the Inspector, and the Editor executes whatever functionality you’ve written.
Read more about creating and using scripts in the Scripting section of this User Manual.
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