Adword- google+search network and content network

I am confused with these terms in Adword. Can someone explain this. How can I use this tool efficiently?

 

Search network expands your searches beyond Google itself. Google partners with some other companies (like AOL), and offers results to them, too. Search network is not a bad thing. Content network is completely different. It's those little ads that you often see on peoples' websites and blogs. Not a good thing to do initially. Turn off this option for now.

 

Thank you flip.
A bold advice!
I will consider turning it off!
sandy

 

I am sure the search network is much better than the content option, but why do you say turn it off?

 

The content network is sometimes better than the search network, and sometimes worse.

But when you're starting up a campaign, the content network can really confuse the stats, so I often switch it off as well, at least until the search campaign is working...

 

I think in content network there is high probability of invalid clicks, but it reaches to greater number of audience