Check out example codes for "unity requirecomponent". It will help you in understanding the concepts better.

Code Example 1

using UnityEngine;// PlayerScript requires the GameObject to have a Rigidbody component
[RequireComponent(typeof(Rigidbody))]
public class PlayerScript : MonoBehaviour
{
    Rigidbody rb;    void Start()
    {
        rb = GetComponent<Rigidbody>();
    }    void FixedUpdate()
    {
        rb.AddForce(Vector3.up);
    }
}

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