Code - Third Person Camera in Unity

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

public class CameraController : MonoBehaviour {

    public float speed = 1;
    public Transform Target;
    public Camera cam;

    // Update is called once per frame
    void LateUpdate () {
        Move ();
    }

    public void Move()
    {
        Vector3 direction = (Target.position - cam.transform.position).normalized;

        Quaternion lookrotation = Quaternion.LookRotation (direction);

        lookrotation.x = transform.rotation.x;
        lookrotation.z = transform.rotation.z;

        transform.rotation = Quaternion.Lerp (transform.rotation, lookrotation, Time.deltaTime * 100);

        transform.position = Vector3.Lerp (transform.position, Target.position, Time.deltaTime * speed);

    }
}