Amazon Silk is a new cloud accelerated browser that comes in the Kindle Fire, available only on Kindle Fire and future Amazon tablets. Silk can function as a standard browser and will be faster than the typical mobile browser. Silk will support HTML5(read eBooks on your Browser) and Flash.
Amazon Silk will leverage the capabilities of the Amazon Web Services (AWS), where rendering web pages will be done in the cloud. Basically, Amazon cloud will act intermediary between the user and the Internet.
Amazon Silk will remember which web pages you visit most often, and preloads them. It has the ability to learn about traffic patterns on each site over time, allowing it to preload the next page you may wish to visit.