There are few differences between Pingbacks and Trackbacks in WordPress blog. They are described as under:
1. Pingbacks and trackbacks use drastically different communication technologies
2. Pingbacks support auto-discovery where the software automatically finds out the links in a post and automatically tries to pingback those URLs while trackbacks must be done manually by entering the trackback URL that the trackback should be sent to.
3. Pingbacks do not send any content.