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Attributes are markers that can be placed above a class, property or function in a script to indicate special behaviour. For example, you can add the HideInInspector attribute above a property declaration to prevent the InspectorA Unity window that displays information about the currently selected GameObject, Asset or Project Settings, alowing you to inspect and edit the values. More info
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from showing the property, even if it is public. C# contains attribute names within square brackets, like so:

public float strength;

Unity provides a number of attributes which are listed in the API Reference documentation:

There are also attributes defined in the .NET libraries which might sometimes be useful in Unity code. See Microsoft’s documentation on Attributes for more information.

Note: Do not use the ThreadStatic attribute defined in the .NET library; it causes a crash if you add it to a Unity script.