Most SEO Company gives a professional service from copywriting to link building and pay per click management. There are a SEO company and individual as well who will on the other hand make shaky claims and also give you false hope.

How can you tell who will deliver? Well, most of that kind of SEO company will mainly make extravagant claims. For example, like telling you they will guaranty you that your website will be top of Google. If you hire a company that uses unethical methods to promote your website, your site could be banned by the Search Engines. You may also be subject to any criminal charges relating to the misuse of your site. So be very careful when choosing an SEO company!