what does lerp stand for code example

Example: what is lerp function

using UnityEngine;public class Example : MonoBehaviour
{
    // Interpolates rotation between the rotations
    // of from and to.
    // (Choose from and to not to be the same as
    // the object you attach this script to)    Transform from;
    Transform to;
    float speed = 0.1f;
    void Update()
    {
        transform.rotation = Quaternion.Lerp(from.rotation, to.rotation, Time.time * speed);
    }
}