Transform are used for storing and manipulating objects Position , Rotation and Scale or Size .

In this blog we will use transform to move an object.Moving an object by changing its transform does not require a Rigidbody, that way its hard to get collision events of the object .

Below code can be used to move a object using transform :

using UnityEngine;
using System.Collections;

public class BlockMovement : MonoBehaviour
 {

    private Vector3 pos ;

    void Update ()
    {
        if(Input.GetKey(KeyCode.UpArrow))
        {
            pos = this.transform.position;
            pos.z +=.1f;
            this.transform.position = pos;
        }

        if(Input.GetKey(KeyCode.DownArrow))
        {
            pos = this.transform.position;
            pos.z -=.1f;
            this.transform.position = pos;
        }

        if(Input.GetKey(KeyCode.LeftArrow))
        {
                pos = this.transform.position;
            pos.x -=.1f;
            this.transform.position = pos;
        }

        if(Input.GetKey(KeyCode.RightArrow))
        {
            pos = this.transform.position;
            pos.x +=.1f;
            this.transform.position = pos;
        }

    }

}