CODE EXAMPLE FOR CSHARP

unity RotateTowards

void Update()
    {
        // Determine which direction to rotate towards
        Vector3 targetDirection = target.position - transform.position;

        // The step size is equal to speed times frame time.
        float singleStep = speed * Time.deltaTime;

        // Rotate the forward vector towards the target direction by one step
        Vector3 newDirection = Vector3.RotateTowards(transform.forward, targetDirection, singleStep, 0.0f);

        // Calculate a rotation a step closer to the target and applies rotation to this object
        transform.rotation = Quaternion.LookRotation(newDirection);
    }