DynamicTyping is a relatively simple idea: you postpone specifying what type AnObject is until the program is running.
DynamicTyping is done by declaring an object as id:
id is the generic type for objects in ObjectiveCee. The statement above means that someObject is an object, but doesn’t specify what type of object it is. someObject could be a window, a button, an array, or something else entirely. It is vaguely analogous to a void pointer in C.
Using DynamicTyping allows for some interesting concepts such as MultipleDispatch, simply by making everything that much more dynamic.