We all know that there are many techniques and procedures for SEO. Backlinks are one of them. You cannot ignore backlinks while doing SEO as backlinks are an important search engine ranking factor. Backlinks are using for 15 years when Google introduces the concept of ‘dofollow’ and ‘nofollow’ in 2005. Backlinks are very important for SEO but we need to understand that not all link types are important or equal. So we will discuss here all about the links; dofollow and nofollow.