Why does Swiss cheese have holes?

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Published on Apr 22, 2014 by SciShow
SciShow explains a) why Swiss cheese has holes, b) what Swiss cheese is called in Switzerland and c) what vested interest the U.S. government has in said cheese holes. Seriously, people.
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Sources:
http://www.ams.usda.gov/AMSv1.0/getfile?dDocName=STELDEV3004468
http://culturecheesemag.com/category/cheese-bites
http://www.livescience.com/33690-swiss-cheese-holes.html
http://mentalfloss.com/article/19045/why-does-swiss-cheese-have-holes
http://www.wisegeek.com/why-does-swiss-cheese-have-holes.htm