Link building is not some abstract form that is used by SEO managers to get more money out of you, it’s a valid field of marketing that can give you plenty of internet exposure when done right. Link building is one of the fastest ways to get your web site to have a much higher score on search engines, meaning it will be easier for people to find you online and to get introduced to what you have to offer them.
The logic behind link building search engines use is pretty simple. If you have a website, let’s say www.arandomnameforawesomewebsite.com, and someone searches for awesome names using google, you might find yourself somewhere on the fifth or sixth page of the google search, the site is brand new, it’s got no backlinks pointed to it, and it’s not very likely to have any interesting content as far as search engines are concerned.
Now, if there are one hundred facebook profyles linking to your site, and if there are sites that themselves have high exposure to the people that index the link to your site, you will have a significantly higher Internet search engine score and will find yourself on much better position, depending on how busy the Internet is in the aspect of the sites that have similar content as yours and depending on status rankings of sites your content clashes with directly.
That is link building, it’s a technique SEO technicians use to make sure your site is linked to, they post the link all over the net, building separate web sites that serve only to boost your rankings and making sure that those same sites have quality content connected to what you are doing, so the search engines recognize them as relevant and raise your site score even more.