The primary goal of a link bait article is to attract the reader enough that they want to link to the material.

Informational:

The goal here is to provide very rare or useful tips and news that benefit the reader. Oftentimes, these come in the form of detailed guides or breaking news articles. This is the most widespread type of hook.

Humor:

Create something funny that catches on across the Web. This is the hardest hook to develop because people like such a wide variety of things and it can be hard to develop something with wide appeal that will generate a lot of links. Lately, humor hooks are generally funny videos.

Negative:

These are articles that are controversial or attack something popular. Negative hooks are not recommended for most business sites because they can also generate negative buzz for the company. They do however generate a lot of traffic and links.

Widget:

Create a tool that is widely needed on your site or create a tool that can be embedded on other people's Web sites and includes a link back. A great example of this is Adobe's Acrobat Reader software. It is linked to from thousands upon thousands of Web sites so that users can view PDFs.

These were few of the famous and most popular link-baiting technique.