Trackback is a product of today's WEB2.0 era. BLOG has become a key part of WEB2.0 and includes the functionality of TRACKBACK. The principle works as follows: In your own space (whether you have established your BLOG or SPACE somewhere), you inevitably post some comments. In the past, the practice was to leave comments below the article, and you might have to check back不定时地 to see how others viewed your comment. TRACKBACK was created to solve this exact problem.