adsense is the ads itself can get revenue. adwords is the advertise you made and be posted on some site and either by google.
For Advertisers: Google AdWords * Advertise to people searching on Google and other advertising network * Reach people actively looking for information about your products and services online * Easily control costs - pay only when people click on your ad For Site Owners: Google AdSense * Maximize your site’s revenue potential with contextually targeted ads * Customize ads to complement the look and feel of your site * Track the success of different formats and locations with online reports Imdad
Adwords will place your ads on google with the payment of yours. Adsense will place ads on your website and you will receive money for every genuine click on it from your website.
in short, you need to pay for adwords, it will bring trafffic to your website. you will get payment from analitics, it will send traffic from your site to others site.
I’m very clear now regarding Google Adwords and Google Adsense. Only when both work, the site earns traffic and money.