What happens exactly when you turn off your Wi-Fi?

I was wondering, for the sake of knowing it, what exactly happens when you turn off the Wi-Fi of a Mac? I normally turn it off before putting it to sleep, because there have been some ocassions where after waking up, the Wi-Fi is on but not working. So I was thinking, what exactly happens with the radio when the computer goes to sleep or it's turned off.
* Is it bad to turn off "hard" your Wi-Fi?
* Is it bad to keep turning on and off the Wi-Fi?
I think that it may have to be something about a Wi-Fi service, but I simply don't know nor found any answer on the Internet.
Thanks in advance.
Mac Mini, 2.8 GHz Intel Core i5
OS X 10.10.3

When your Mac goes to sleep, the wifi is automatically turned off. When you wake the Mac up, your wifi will turn back on and hopefully will reconnect a short time later.
The purpose of Sleep is to save on energy, so wifi will be shutdown, as it is a significant energy drain.

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