TrackBack is designed to provide a method of notification between websites. More people are introduced to the conversation and that there is a level of authenticity to the trackback comments because they originated from another weblog. There is no actual verification performed on the incoming trackback. Here is one same explanation with example:
* Owner of the Blog A has writes something on their blog.
* Visitor B wants to comment on A’s blog but wants their own readers to see what they had to say and be able to comment on their own blog
* Visitor B posts on their own blog and sends a trackback to A’s blog
* A’s blog receives the trackback and displays it as a comment to the original post. This comment contains a link to Visitor B’s post.