Getting indexed
The leading search engines, such as Google, Bing and Yahoo!, use crawlers to find pages for their algorithmic search results. Pages that are linked from other search engine indexed pages do not need to be submitted because they are found automatically. Some search engines, Yahoo!, operate a paid submission service that guarantee crawling for either a set fee or cost per click. Programs usually guarantee inclusion in the database, but do not guarantee specific ranking within the search results. Two major directories, Yahoo Directory and the Open Directory Project both require manual submission and human editorial review. Google offers Google Webmaster Tools, for which an XML Sitemap feed can be created and submitted for free to ensure that all pages are found, pages that are not discoverable by automatically following links.
SEO crawlers may look at a number of different factors when crawling a site. Not every page is indexed by the search engines. Distance of pages from the root directory of a site may also be a factor in whether or not pages get crawled.
Preventing crawling
To avoid undesirable content in the search indexes, webmasters can instruct spiders not to crawl certain files or directories through the standard robots.txt file in the root directory of the domain. A page can be explicitly excluded from a search engine's database by using a meta tag specific to robots. When a search engine visits a site, the robots.txt located in the root directory is the first file crawled. The robots.txt file is then parsed, and will instruct the robot as to which pages are not to be crawled. As a seo crawler may keep a cached copy of this file, it may on occasion crawl pages a webmaster does not wish crawled. Pages typically prevented from being crawl include login specific pages such as shopping carts and user-specific content such as search results from internal searches. In March 2007, Google warned webmasters that they should prevent indexing of internal search results because those pages are considered spam.
Increasing prominence
Methods can increase the prominence of a webpage within the search results. Cross linking between pages of the same website to provide Lot of links to most important pages may Raise its visibility. Writing content that includes frequently searched key-word phrase, so as to be a wide variety of search queries will increase traffic. Updating content so as to kept search engines crawling back frequently give additional weight to a site. Adding relevant keywords to a web page's meta data, including the title tag and meta description, will improve the relevancy of a site's search listing, thus Raising traffic. URL normalization of web pages accessible through multiple urls, using the canonical link element or via 301 redirects can help make sure links to different versions of the url all count towards the page's link popularity score.
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