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Showing content from https://docs.unity3d.com/Manual/2d-physics/../../ScriptReference/Object-operator_eq.html below:

Unity - Scripting API: Object.operator ==

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Compares two object references to see if they refer to the same object.

using UnityEngine;
public class Example : MonoBehaviour
{
    public Collider target;
    void OnTriggerEnter(Collider trigger)
    {
        if (trigger == target)
        {
            print("We hit the target trigger");
        }
    }
}

Get early out if there is no target.

using UnityEngine;
public class Example : MonoBehaviour
{
    public Transform target;
    void Update()
    {
        // Early out if the target is gone
        if (target == null)
        {
            return;
        }
    }
}

Be careful when comparing with null.

e.g.

Instatiating a GameObject adds it to the Scene so its completely initialized (!destroyed). Instantiating a simple UnityEngine.Object has no such semantics, so the it stays in the 'destroyed' state which compares true to null.

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