GameObject.tag

Description

The tag assigned to the GameObject.

A tag can be used to identify a GameObject. Tags must be declared in the Tags and Layers manager before using them.

Note: Do not set a tag from Awake() or OnValidate(). The order in which `Awake` is called is not deterministic between components and a tag can be overwritten when its `Awake` is called. If you do this, Unity generates the warning SendMessage cannot be called during Awake, CheckConsistency, or OnValidate.

The example below sets the current GameObject's tag to "Player" and then implements MonoBehaviour.OnTriggerEnter to check if the Collider on the other object involved in a collision with this object is tagged "Enemy".

using UnityEngine;

public class Example : MonoBehaviour
{
    void Start()
    {
        //Set the tag of this GameObject to Player
        gameObject.tag = "Player";
    }

    private void OnTriggerEnter(Collider other)
    {
        //Check if the collider of the other GameObject involved in the collision is tagged "Enemy"
        if (other.tag == "Enemy")
        {
            Debug.Log("Triggered by Enemy");
        }
    }
}

Additional resources: GameObject.CompareTag, MonoBehaviour