Google is all about Openness, that’s why they love to share the information with their users. In their continued efforts, they have unveiled few Videos that walk you through almost everything (as a beginner) you need to know how their Core business Products Work.
First off, Matt Cutts walks us through How Google Crawls, Indexes and Ranks web Pages on the web. And further, they talk about some basics of their proprietary algorithm- PageRank:
Next Off, Nundu tells us how Relevant Ads are displayed on Search Pages:
And in the last they talk about How their Google Apps work. This includes all the business Apps in the App Marketplace: