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Advertising with banners works by charging you a fixed amount per thousand times your banner is displayed to a user. The advertising rate is referred to as Cost per thousand ads.
Also called bots or spiders; programs that follows links to visit web sites on behalf of search engines. Crawlers then process and index the code and content of a web page according to an algorithm and store the pages in the search engine's database. Googlebot is the crawler that travels the web finding and indexing pages for the Google search engine.
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