Ram broken, need new Ram. help me

I bought my Mac Pro 13inch ,manufactured in late 2011. I have been using my macbook pro for 8months and started to kernal panics.
When I bought my mac pro , I upgraded Ram to 8GB at apple store. im clueless when it comes to computers. Why RAM is broken? How did it happened? Do I need to buy Ram from apple or third party? Is there any risks or difference? When i first upgraded it at the apple store in Singapore, I paid 8$ more with price of the Macbook Pro.
About the Mac Pro im using : Mac OS Ver: 10.7.2
HArd drive 500 Gb.
Can u explain it to in simple english? thank you. what is RAM and its purpose?

Not sure about Canada, but OWC (Macsales) and Crucial are the best places to go for Mac RAM.
These from Macsales - http://eshop.macsales.com/MyOWC/Upgrades.cfm?sort=pop&model=438&type=Memory
Or these from Crucial - http://www.crucial.com/store/listparts.aspx?model=MacBook%20Pro%202.4GHz%20Intel %20Core%20i5%20%2813-inch%20DDR3%29%20Late-2011&Cat=RAM
Should be suitable.
I'm intrigued as to how the tech said the RAM wasn't from Apple, though.
Apple doesn't make RAM; it uses the same manufacturers as all the others do, albeit with rather tighter quality specifications.
Hynix and Samsung are two frequently encountered (from the 3rd party retailers, too), but there are many others.

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