Since we can add an array into an array, we can create multi-dimensional arrays, which have very useful applications (e.g. a matrix):

```
const matrix = [
[1, 2, 3],
[4, 5, 6],
[7, 8, 9]
]
matrix[0][0] //1
matrix[2][0] //7
```

Arrays: Arrays of arrays

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Since we can add an array into an array, we can create multi-dimensional arrays, which have very useful applications (e.g. a matrix):

```
const matrix = [
[1, 2, 3],
[4, 5, 6],
[7, 8, 9]
]
matrix[0][0] //1
matrix[2][0] //7
```