Check out example codes for "unity 2d detect click on sprite". It will help you in understanding the concepts better.

Code Example 1

if (Input.GetMouseButtonDown(0)) {
            Vector3 mousePos = Camera.main.ScreenToWorldPoint(Input.mousePosition);
            Vector2 mousePos2D = new Vector2(mousePos.x, mousePos.y);
            
            RaycastHit2D hit = Physics2D.Raycast(mousePos2D, Vector2.zero);
            if (hit.collider != null) {
                Debug.Log(hit.collider.gameObject.name);
                hit.collider.attachedRigidbody.AddForce(Vector2.up);
            }

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