Forum Moderators: Robert Charlton & goodroi
On one of my sites, I used to get more visitors from a referring site than from search engines. --Now, most of the visitors simply use their bookmarks... ;-)
But it means that inbound links are major source of traffic. If you have a site about widgets, the biggest number of visitors interested in your content are visitors of other big sites about widgets. Nothing can bring you so much traffic as inbound link on big site in your specialty!
As for inbound links from of-topic sites - it's a matter of marketing expertise, which other branches can lead customers to your industry, and which cannot.