Advertisers are guided along the way when opening an account, provided with numerous tutorials, and given access to a variety of tools to help you track and optimize your bidding and keyword choices. With a searchable support database, almost any question can be answered in seconds.
The Google paid ad display is the industry standard. An ad appears along the right side of the search results page or within content pages if content search is on. Recent changes in ranking parameters concentrate not just on bids, but also on the quality and relevance of your ad and the landing page associated with your ad (and indeed your entire website). This “Quality Score” concept has led to keywords becoming inactive for search plus reports of many huge jumps in keyword pricing.

The clean interface (recently patented), its broad access to products still in development (but relatively bug-free), and well-supported advertising package (AdWords) appeal to the majority of users and advertisers.
Local search with advanced mapping via Google Earth, day-parting, geo-targeting, site targeting, free Google Analytics, the choice of contextual advertising, site map generation, Webmaster Central—the list of options and useful tools for advertisers to choose from is long and varied.
Benefit:
A low $5 startup fee, and many promotions offered.
No clear definition of “invalid clicks" (fraudulent clicks).
Comprehensive, free web analytics package.
Many factors relating to how “Quality Score” is defined can lead to disabling of keywords or high keyword costs
No monthly minimum amount of spending required.
Excellent set of tutorials and searchable support database ensures that any question you may have about AdWords is answered as quickly as possible.