Search Engine Optimization (SEO) – the adjustment process of using HTML-code, text content (content), site structure, and also control of outside factors that are taken into account in the algorithms of search engines, It has found a great popularity in previous decade, Its something which is different from Web designing or Programming is the method to raise the site position against some keywords in search results according to the individual behavior of the users. The higher the position of a site in search results, and more potentially more certain clients may visit the site, buy from it and expert says, the company who leaves working on its seo campagains if fails any time then Lake of SEO is the real cause of its Failure. Because SEO is not name of one technique, But a group of techniques & mostly it is based on research and analysis.

density of keywords (phrases) –
Sophisticated algorithms of modern search engines allow the conduct of semantic analysis of text for the purpose of  spam filtering –if it filters each keyword and some time even a paragraph where the keyword phrase is found too often on the page (above a certain percentage of the entire text)

links also play a vital role in boost up of website, quantity and quality of resources with hyper link to your site gives a strong idea to search engine that “this link is of good worth” and it like to drive traffic to this link thinking it a genuine and fresh site.
many search engines do not account for the interconnections between sites, it is advised to be remain in your own niche if link exchange, in link exchange two websites owners exchange link with one and other, exchange of hyper links with one and other drives web traffic to both sites, one should always link exchange with thematically related sites, Otherwise this option will be useless and even harmful for the  progress of website.

Work on site optimization involves working with internal factors – the alignment of text on the site in accordance with the selected keywords (phrases) to increase the quality and quantity of texts on the site, optimization of the structure, navigation and internal links on the site, and also with external factors – exchange of hyper links, registration in catalogs and directories, and other techniques aimed at increasing the number and quality of hyper links directed to the resource.