My blog about increase web site traffic
Services such as Seo services can be used for various types of search which can range from being industry specific to local area specific to image search. In mid 1990's Webmasters and content providers stared optimizing the sites for the search engines. Search engines would send a spider to "crawl" across the page or the URL submitted by the webmasters and this spider in turn would extract the links of other pages on that page and submit it for indexing purposes. This was a two step process where the spider after "Crawling" the page would save the information on search engine's own server where a second program known as the indexer would extract the relevant information from page. For crawling at later date the data was saved in a scheduler.