Let's start with the array data structure. You can use it to store many variables of the same type, such as int, string, or a user-defined class. As mentioned in the introduction, while developing applications in the C# language, you can benefit from a few variants of arrays, as presented in the following diagram. You have access not only to single-dimensional arrays (indicated as a), but also multi-dimensional (b), and jagged (c). Examples of all of them are shown in the following diagram:
What is important is that the number of elements in an array cannot be changed after initialization. For this reason, you will not be able to easily add a new item at the end of the array or insert it in a given position within the array. If you need such features, you can use other data structures described in this chapter, such as generic lists.
