What happen exactly when iPad is in STOP / Standby?

Hi and thanks for reading.
The title is quite clear as the body of this question
What happen exactly when I stop my iPad to apps etc?
I notice that my wifi is still active for certain operations: for example, I can receive push mail, facetime calls, but not skype phone calls... ??
Are core apps still on and workable while extra apps like skype not?
What else nice to know?
Thanks, cheers

Yes there are certain iOS core apps that are allowed to run in the background.  One of these is the Mail app so that push mail or scheduled fetch mail will work without having to have the screen on and the phone active.  the clock is another one (the built in clock that comes as part of iOS) so the alarm functions still work when the phone is asleep.  Notifications is another app that runs in the background.
However, the majority of apps and all 3rd party are incapable of running in the background (the iOS actually is designed this way, so wayward apps cannot run up data or drain the battery).  Skype, for example, is only active when open and running actively in the foreground.

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