App

Question

Is it useful? I still don't get Arrays

Answer 1

Erm, list's in System.Collections are just objects that use arrays internally. Arrays are not history. You don't need to use lists for simply holding multiple variables. Lists just bring some advantages, such as adding elements to a filled array.

The List class uses a private array of generic type.
That is no different than creating a class and creating a global non-static private array.

https://referencesource.microsoft.com/#mscorlib/system/collections/generic/list.cs

You can make your own List. Here's one I made:
(The List is called Inventory. It's only a bit different since I didn't use generics)
https://code.sololearn.com/cbtL200Up5bz/?ref=app
(It's not that optimized though).

PS:
A linked list on the other hand does not need to use an array.

Answer 2

Since there are lists and collections arrays are history. They still work though but are less advanced and do have their constraints.(notice your title is not descriptive)