Unity2D How to ignore collisions with specific objects?

Question

I am using an animated sprite to collide and delete an enemy sprite. The enemy sprite disappears when it hits my floor (sprite) also. (All have rigidbody2D). How do I get the enemy sprite to ignore the floor and everything else except the animated sprite?

using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class Collision : MonoBehaviour
{
    void Start()
    {

    }

    void Update()
    {

    }

    void OnCollisionEnter2D()
    {
        if (gameObject.tag.Equals("Enemy"))
        {
            Destroy(gameObject); 
        }
    }
}

Answer 1

Go to Edit > Project Settings > Physics (or Physics2D ) and edit the Layer Collision Matrix: