what is it?
plz tell in detail i m just a begineer

Read this

Its Google's pay per click advertising system that allows you to pay to advertise your business alongside Google search results.

What is Google Adwords?

Google AdWords is a quick and simple way to purchase highly targeted cost-per-click (CPC) advertising, regardless of your budget. AdWords ads are displayed along with search results on Google, as well as on search and content sites in our growing ad network, including AOL, EarthLink, HowStuffWorks, & Blogger. With more than 200 million searches on Google each day and even more searches and page views on our ad network, your Google AdWords ads reach a vast audience.

Basically there are two sides to it from a webmaster's point of view. 1) It is a means by which to advertise your website, service or product. You determine how much your budget is and it creates a custom ad campaign based on that and some other criteria you specify. 2) It is a means to monetize your website. You sign up to get paid to display Google Adwords on your site as well. Obviously, higher traffic = more income.

Originally Posted by somveer

what is it?
plz tell in detail i m just a begineer

If you have the ability to post in this forum, then you can certainly can search Google for the answer.
http://www.google.com/search?q=google+adwords

Google adwords has a decent and effective system of advertising. It appears to be costly but not really so if you are selective.