Building a powerful link profile is one of the most important aspects of an SEO marketing campaign. There are numerous types of links as well as an equally broad range of methods to obtain those links. A link profile should be diverse and should not include any methods that search engines deem to be black hat SEO.
Link popularity is a basically the measure of links pointing to your website and is meant to be a measure of the best websites. Theoretically those websites that have the most links pointing to them must be important and thus worth the visit. Unfortunately, there are a lot of folks out there that have created programs to "boost" your popularity artificially and all they have done is create spam and muddy the picture. The search engines and directories are keeping a close eye on these programs.
It's a well known fact that the more sites that link to your web site; the higher your rankings can be in search engines such as Google - but not all links are created equal.
Link Building Introduction