The power of search engine marketing results in the brand promotion of a business across the online world, which is not bound by any boundaries. Traditional marketing can help only to target particular locations and areas, but search engine optimization and marketing, can get a business visible across several locations with ease.
The ads related to a business appear in the sponsored section above the Google search results (for example). These ads appear for particular keywords for which that business's bid is higher than any other business. Again, it is not certain that the business ad would always appear there for those particular keywords. It all depends on the amount of competition while bidding for ad spaces with other businesses, for those particular set of keywords.