In JavaScript, an array can contain not only simple values like numbers and strings, but also other arrays. This is known as a multidimensional array.

A multidimensional array is an array in which each element can also be an array. This allows us to represent data in a structured and hierarchical manner.

For example, imagine we want to represent a matrix—a grid of numbers. We can use a multidimensional array to achieve this:

1const matrix = [
2  [1, 2, 3],
3  [4, 5, 6],
4  [7, 8, 9]
5];
6
7console.log(matrix);

In this example, matrix is a 2-dimensional array with three rows and three columns. Each element of the matrix array is itself an array representing a row of numbers.

Multidimensional arrays have practical applications in various domains, particularly when dealing with tabular data or representing complex structures. They allow us to work with data in a more organized and intuitive way.

Keep in mind that when working with multidimensional arrays, we need to use nested loops to iterate through the elements. This allows us to access each individual element of the array and perform operations on them.