Let's start with arrays, which is one of the two main topics in the first chapter. You can use this data structure to store many variables of the same type, such as int, string, or a user-defined class. The important assumption is that the number of elements in an array cannot be changed after initialization. Moreover, arrays belong to random access data structures, which means that you can use indices to get access to the first, the middle, the n-th, or the last element from the array. You can benefit from a few variants of arrays, namely single-dimensional, multi-dimensional, and jagged arrays, also referred to as an array of arrays.
All of these variants are shown in the following diagram:
There are a lot of applications of arrays ...
