how to find distance between two points in unity code example

Example 1: unity rotation between 2 points

transform.rotation = Quaternion.FromToRotation(Vector3.up, v3Pos2 - v3Pos1);

Example 2: how to compare distance between 2 objects unity

float distance = Vector3.Distance (object1.transform.position, object2.transform.position);

Example 3: unity get distance between two objects

// Vector3.Distance is the same as (a-b).magnitude

float distance = Vector3.Distance(a.transform.position, b.transform.position);