use of a 2-d array

guys, we use like a 2-d array very often.
But what exactly is the use of a 2-d array ?

Now when i look at it, i feel everything can be done using a 1-d array and incrementing the pointer appropriately.
Is the only advantage of a 2-d array , matrix representation ? (By the way, matrices are very important, i understand cuz its matrix multiplication that happens in GPU's)

But can someone give me another example, or induce a different kind of thought into this.

Thanks.

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