[Jamestown1630]

This was very confusing to me - I drink bottled or canned beer; but I think they’re referring to draft beer:

http://www.draft-beer-made-easy.com/carbonation.html

[Pontiac]

That (your link) was supposed to be easy?

[IndispensableDestiny]

This was very confusing to me - I drink bottled or canned beer; but I think they’re referring to draft beer:

Pressurized carbon dioxide is used to move the beer from the keg to the tap. Running out of CO2 is as bad as running out of beer.

[AFreeBird]

Yea, CO2 is used to pressurize the kegs.