Here is the definition provided by www.haloscan.com:
Trackback is a system that alerts and allows a blogger to see who blogged about posts in his/her blog. The system works by sending a ping between the blogs, and therefore sending an alert.
Say what!? Ano daw (tagalog of say what)!? Can someone explain to me in plain english or tagalog??? Please helllllllppppppppp!!!?!!!