Checked with version: 4
Tags in Unity, how to use them in the editor and via code.
Beginner Interface & Essentials
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Tags are a way of identifying game objects in Unity.
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As a name of a single object could identify it,
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it can be useful to set tags also.
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For example you may have an object called Ork or Tank
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but these could all be tagged Enemy,
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and in your code you could check for any objects
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that have the tag Enemy.
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Likewise a script on an enemy could check for a player character
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by looking for a player tag.
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To assign a tag to an object, select it and use the
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drop-down menu at the top of the inspector.
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If the tag you want isn't already present then add a new tag.
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You can add a tag by clicking the option at the bottom of the menu
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and then entering it in the list of tags at the top
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of the tag manager.
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Once you've done this, return to the object you
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wish to place the tag on
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and select it from the drop-down.
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There are a number of functions in code,
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which will allow you to find objects with tags,
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the simplest one of these is GameObject.FindWithTag,
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which allows you to specify a string with the name
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of the tag inside it.
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This script is attached to my enemy object
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and I can use that to find an object with the tag Player.
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So I'll set my robot to be tagged Player
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and when the game starts my enemy is seeking out that
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object and looking at it.
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Likewise you could find multiple objects with the same tag
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by using FindGameObjectWithTag.
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See the scripting reference for more examples of this.