How are the web pages indexed by the different search engines? It is done by a web crawler. A web crawler a web robot/spider is a program or automated script that browses the World Wide Web in an automated and systematic way. These specialised Website crawlers are used by all the leading search engines, Google, Yahoo! and Microsoft to find web pages for their algorithmic search results.
A great part of these web pages lie in the deep or invisible Web. How can such pages be accessed by the robots? These pages can only be accessed by submitting queries to the database, and cannot be regularly indexed or found by the web crawlers.
Often search engines also have paid submission service that guarantee crawling for either a set fee or cost per click. Such programs usually guarantee inclusion in the database, but do not guarantee specific ranking within the search results.
Another SEO function is making a sitemap. What is a sitemap? A sitemap is an XML file that lists all the URLs for a site with more details on each of them. Sitemap requires an XML type feed to be created and submitted for free so that we become sure that all web pages are found, especially the pages without direct link.
It is also possible to avoid the robots and hide certain pages without getting it indexed if not wanted by web masters. The use of the Robots Exclusion Protocol or robots.txt protocol is a method to prevent the web spiders and web robots from accessing all areas of a website.
Outsource Strategies International (OSI) is a US based BPO company that offers specialty SEO services including, India SEO, PPC services, directory submission, link exchange, search engine optimization marketing, SEO copywriting, and PPC search engine internet marketing.