Deep links can instantly get users to targeted information and thus decrease frustration.
Deep links can improve your overall link profile.
Deep links can grab traffic from new and varied sources.

Deep linking is a tool used by websites to point a visitor directly to a page within the website instead of the landing page or front page of the site. Deep linking allows visitors to go directly to the information they require, which may be available on a certain page of the website, but not on the web page to which the basic link leads.