Search Engine Optimization has created a new league of web activity and promotion. A number of organizations now outsource their search work to SEO companies who have the required skills and expertise to carry out the task. However companies need to make sure that they hand in their work to genuine SEO firms and for that there is a general criterion that could help in recognition of a professional SEO company. First and foremost an SEO company should have detailed, in-depth knowledge of both the search engine optimization processes and the changing trends of the present day scenarios in the markets worldwide in order to be up to date. Most professional SEO companies resort to research and frequent brainstorming forums which is a constant prodigy of SEO professionals. Another very important thing is to have an understanding of the diverse developments of search engine and its directories. There is a difference between search engines that are directory based and search engines that are robot based, which is not known by a layman so he cannot carry out the optimization proficiently. The search engines that are based on the directory are operated by humans and evaluation is done on a manual account. Wherein humans dictate the possibility of any website submitted in the directory, whether they are meeting the search engine criteria or not. SEO is not a simple task to conduct as there are robot based search engines as well. Here there are some variable algorithms of search engines, which changes on a frequent base. Spiders are automated software android. The function of these spiders is to crawl and read the content within the web pages. They determine whether these pages can be indexed or not and whether they meet the search criteria or not. Now if organizations were to their optimization themselves they would need to have some knowledge of such information whereas a professional SEO company would be excelling in this. Professional SEO companies are fast in adapting pace with the frequently changing algorithms of major search engines and they change their search engine marketing strategies accordingly. The algorithms have come a long way and emerged smarter. SEO companies have corresponded in the same way, by acquiring excellence in Search Engine Optimization, Search Engine Marketing, Search Engine Submission, Internet Marketing, Blog Writing and SEO Copywriting. For e.g. Opal Infotech is an internet marketing specialist with vast experience of search engine optimization technology. Internet marketing is quite different than website submission in the search engines. Opal Infotech clients for search engine optimization are in many countries including UK, USA, Greece, Canada, Spain, Africa, Netherlands etc. They only apply natural and ethical techniques for search engine optimization to position your website in top search engine rankings.