Android: How to make a Button to move in Layout?

I want to add this code, but i want to know what is the purpose of each line of this code?

<?xml version="1.0" encoding="utf-8"?>
<set xmlns:android="http://ift.tt/nIICcg"
android:interpolator="@android:anim/linear_interpolator">
<translate
   android:fromXDelta="0"
   android:toXDelta="100%p"
   android:duration="500"
   android:repeatCount="1"
   android:repeatMode="reverse"/>
</set>