Google's search engine marketing is one of the leaders in marketing in the Western world, and search engine marketing is its biggest source of profit. Google's search engine provider is significantly ahead of Yahoo and Bing networks. The display of unknown search results is free, while advertisers are willing to pay for each click on the ads in the sponsored search results.
Paid inclusion
Paid inclusion is when a search engine company shandong mobile phone number list charges a fee for including a website in its results pages. Paid inclusion products are also called sponsored listings, and most search engine companies offer paid inclusion products in the main results area or in a separately identified advertising area.
This fee structure can both filter out redundant submissions and increase revenue. Typically, the fee consists of an annual subscription for a web page that is automatically indexed on a regular basis. But some companies experiment with non-subscription fee structures, where the purchased listing is displayed permanently. Pay-per-click fees may also be charged. Each search engine is different. Some sites only allow paid inclusion, but this practice has little success. More commonly, many search engines, such as Yahoo!, mix paid inclusion (per-page and per-click) with web crawl results. Other search engines, such as Google (and Ask.com since 2006), do not allow webmasters to pay to be included in their search engine listings (ads are displayed separately and marked).
Some critics of paid inclusion claim that it causes searches to return results based more on the economic status of a site's interests than on that site's relevance to the end user.
In general, the line between pay-per-click advertising and paid inclusion is controversial. Some lobby to have any paid listings labeled as ads, while defenders insist that they are not actually ads because webmasters have no control over the content of the listing, its ranking, or even whether it is displayed to any user. Another advantage of paid inclusion is that it allows site owners to specify a specific schedule for crawling pages. In the general case, people have no control over when their pages are crawled or added to the search engine index. Paid inclusion has proven to be particularly useful in cases where pages are dynamically generated and frequently modified.