Portable shared/dynamic libraries with c++ and cmake

Hi everyone.

I'm working on a project that uses a plug-in-like arquitecture.

Right now i'm working on Linux and to implement the plugins I'm using Shared Objects (.so). I load the plugins with the dl API.

On windows there are dlls which are managed in very different way.

Now, in mac OSX i'm a bit confused. I see there are dylib, so, frameworks and bundles (besides other things).

I'm not sure what's the difference between them and what should I use to implement a plug in.

Can anyone point me in the right direction here?

THanks.