We have an array called items.
It has 4 items.
If we want to get the second
item from the array,
then we need to say items[1].
In computer science, the
first position is 0 and not 1.
If we want the third item,
then we need to say items[2].
For the 4th item, we need to look for [3].
You can see the pattern.
It means that the first
item of an array starts at
zero and not at one.