How to register to Google Adsense? How AdSense works?

There are some instructions which help you to register to Google Adsense.

1. Go to https://www.google.com/adsense/ and register an account. After Google does some verification, you will receive a small bit of javascript coding to place on your website. The whole setup process is very easy to do.
2. Place the coding on your design pages of the website, and ads will begin to appear when people visit your website. The Ads will be related to the visitors location, the content of your site, or other factors.
3. You will begin to earn money based on a per-click or per-impression basis depending on the ad. Google has not released the formula they use to determine how much you will make based on the visitor clicking an advertisement. Therefore, it is unknown what you will earn for the ads. This has been a point of contention with Google Adsense.
4. Also, please note that Google will only pay you once you earn $100. For most smaller websites, this will take a very long time. However, if you choose to close your Adsense account, Google will pay out to the account holder if they have more than $10.
5. To help maximize profits, some website owners have discovered ways to trick Adsense. Please visit the Wikipedia page for ideas on this:http://en.wikipedia.org/wiki/AdSense

How AdSense works?

Reference: http://en.wikipedia.org/wiki/AdSense#How_AdSense_works

• The webmaster inserts the AdSense JavaScript code into a webpage.
• Each time this page is visited, the JavaScript code uses inlined JSON to display content fetched from Google's servers.
• For contextual advertisements, Google's servers use a cache of the page to determine a set of high-value keywords. If keywords have been cached already, advertisements are served for those keywords based on the AdWords bidding system. (More details are described in the AdSense patent.)
• For site-targeted advertisements, the advertiser chooses the page(s) on which to display advertisements, and pays based on cost per mille (CPM), or the price advertisers choose to pay for every thousand advertisements displayed.^[13][14]
• For referrals, Google adds money to the advertiser's account when visitors either download the referred software or subscribe to the referred service.^[15] The referral program was retired in August 2008.^[16]
• Search advertisements are added to the list of results after the visitor performs a search.
• Because the JavaScript is sent to the Web browser when the page is requested, it is possible for other website owners to copy the JavaScript code into their own webpages. To protect against this type of fraud, AdSense customers can specify the pages on which advertisements should be shown. AdSense then ignores clicks from pages other than those specified.