A reference profile is a combination of all links, pointing to the website and its individual pages. Also, the name option of this term is often used - reference mass.

Building a link profile is one of the main components SEO-provements. It is worth knowing and remembering that search engines take into account not only the amount external links, but also their quality. 

Therefore, placing a lot of links on just a few donors will not bring the expected results. Donors must be different, have their own authority and match by subject with an promoted website.

The reference mass should look natural in the eyes of search engines. Therefore, it cannot be built up too quickly. This process should be smooth, gradual and, most importantly, regular. It is also important that different ones are used anchors and so that most of the profile (about 2 / 3) is unencorn links

Otherwise, search engines may suspect use purchased links and apply sanctions, underestimating site position or completely excluding it from index.