Amazon Web Services (AWS) offers reliable, scalable, and inexpensive cloud computing services. Amazon Web Services is a subsidiary of Amazon.com that provides on-demand cloud computing platforms to individuals, companies and governments, on a paid subscription basis. The most important concept is that, when you are growing, your cost should grow over the same dimension your revenue is coming in over. For Amazon.com that dimension is number of orders. If orders go up your cost should be allowed to rise as well. Although if you are architected well, you will be able to exploit economies of scale and your cost will rise less than the rise of your revenue. If you are architected correctly for cost-awareness scale becomes your friend.