Welcome to today's session on "Multidimensional Arrays and Their Traversal in Scala." In Scala, we can use arrays to hold multiple arrays at each index, akin to having nested collections. You can imagine these arrays as an "apartment building," where each floor corresponds to an outer array and each apartment on a floor corresponds to an inner array. Our aim is to build your foundational skillset in handling these "apartment complexes" efficiently in Scala.

In Scala, a multidimensional array is created using nested Array structures. Here is an example of a 2-dimensional array:

In this example, array is a 2-dimensional array, much like a 3-story "apartment building," where each floor represents an inner array.

All arrays in Scala are 0-based. Suppose we want to access an apartment on the second floor (index 1) and deliver a package to the first unit (index 0) of this structure. Here's how you can do it:

Here, the number 1 in the first pair of parentheses refers to the second inner array, and 0 refers to the first element of that array.