An inbound link is a hyperlink transiting domains. Links are inbound from the perspective of the link target, and conversely, outbound from the perspective of the originator. Inbound links were originally important (prior to the emergence of search engines) as a primary means of web navigation; today their significance lies in search engine optimization (SEO). Increasingly, inbound links are being weighed against link popularity and originating context. This transition is reducing the notion of one link, one vote in SEO, a trend proponents hope will help curb linkspam as a whole.