At first lets discuss about the technique of seo is called black hat SEO or spamdexing. It uses methods like link framing and keyword stuffing. These both techniques degrade both the relevance of search results and the user-experience of search engines.

Sometimes seo companies act aggressively in order to make their clients website’s ranking good enough but their effort can ultimately damage the website’s reputation and get banned from search result. Using some high risk techniques can be fatal for the website.

The leading search engines, Google, Yahoo! and Microsoft, 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, notably Yahoo!, operate a 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. Yahoo's paid inclusion program has drawn criticism from advertisers and competitors. Two major directories, the 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, especially pages that aren't discoverable by automatically following links.

For every black, there is always a white. The same is true for SEO services. White Hat SEO services, on the other hand, relies on the advantages of putting in relevant and quality content as well as effective marketing strategies to place sites on top of search engine rankings. SEO services providers that offer White Hat SEO will focus mostly on your site contents. White Hat SEO providers will help you come up with contents that will attract people, and not search engines into your site. You should know that content is a very important factor in SEO building (if not the most important). With good content, White Hat SEO services will be able to get you more inbound links from other relevant websites. White Hat SEO is definitely considered to be the better SEO tool. It will not put your site in the risk for getting blacklisted and does not violate any search engine SEO guidelines. Most importantly, visitors who check your site will most likely be converted easily with your great content.

Grey Hat SEO is mid-way between the two tools above and is all about the balance between risk and reward. There are actually a wide number of SEO services solutions categorized under this. Some Grey Hat SEO services may tend to use more dubious strategies and take even bigger risks to produce fast and high search engine rankings. While many Gray Hat SEO services methods obey search engine guidelines, others might put you at risk. If you opt for SEO services using Grey Hat, be sure about what you are exactly subjecting your online site to.