List object allows you to create a list, add things to it, remove it, update it, index into it etc etc and that's all very good. List is used whenever you just want a generic List where you specify object type in it and that's it.
IList on the other hand is an Interface. Basically, if you want to create your own type of List, say a list class called SimpleList, then you can use the Interface to give you basic methods and structure to your new class. IList is for when you want to create your own, special sub-class that implements List.
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