What's the difference between a non-unmanaged type and a managed type?

Question

When I wrote the following snippet for experimenting purposes, it raised the hover-error (see screenshot):

Cannot declare pointer to non-unmanaged typ

Answer 1

You cannot create a pointer to a managed type. While int, double, etc are managed, they have unmanaged counterparts.

So what non-unmanaged type really means is the managed type.

The problem here is that the managed type since is sitting on the heap, you cannot get a pointer to. You can get a pointer using fixed keyword but that is mainly for arrays.