I have always wanted to know the answer to this question for ages. Most SEO companies claim they can rank you top in Google and search engines alike for your chosen keyword(s). Just how do they do it?
Right now multi-tiered contextual link structures are popular. So it a combination of wikis, web 2.0s and profiles links blasted to the properties.
The simple answer is, If you are a barber and you better know how to cut the hairs it is not important that all the people can cut the hairs. Basically they know what they are doing they work hard into it to know the methods of cutting they read books and even take courses. So in the same way every one has a profession So do Seo Companies.
You will find a lot of the larger SEO companies have a huge range of PR domains on separate Class C IP's so they can link to you in bulk - and then mix in the standard submissions, social bookmarking, articles and more. It's all about finding a balance and keeping things looking as natural as possible. Absolutely pointless reply.
By far contextual backlinks are the best with the anchor text being those words you are trying to rank. Aim for domains that have authority and are aged.
SEO companies have good amount of site where they create links and man power of experts of SEO . so the archive the target
SEO Companies keep themselves updated on the Latest Trends on which Search Engines rank websites. Accordingly they perform activities like On Page SEO - changes made to the websites (Like Title & Meta tags, Keyword rich Content....) to make it SEO friendly & Off Page SEO - building Links across the web for your website.