Link Baiting & Link Building

Matt Cutts defines link bait as anything "interesting enough to catch people's attention. Link bait is any content or feature within a website that somehow baits viewers to place links to it from other websites. Link bait can be an extremely powerful form of marketing as it is viral in nature.

Most common approaches of Link Bait

• Informational hooks
• News hooks
  
• Humor hooks
• Evil hooks
  
• Tool hooks
• Widgets hooks
  

Source:
http://en.wikipedia.org/wiki/Methods_of_website_linking
http://www.copyblogger.com/increase-web-traffic/