How do I use arrays?

I'm trying to make a snake game and there's this forum post saying use arrays and had a link to the manual, I read the manual section on arrays but its all very confusing to me, how do I use arrays (in general not just with a snake game)? How would it work with a Snake game exactly...?

You can use two-dimensional arrays to track the locations of the all of the snake's body parts, saying you have a part at {1,1} and another part at {1,2} and the next part at {1,3} and a tail at {2,3}.

So you would just fill your two-dimensional array with 1s and 0s; 1 meaning snake body, 0 meaning no snake body.

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