Trackbacks allow one weblog (or website) to post a comment to another site without actually having the user visit the site to post a comment. Using the trackback URL accompanying each post, other weblog can send a ping across the Internet to your CivicSpace site. Once received, the trackback will show up on the trackback page accompanying the post.
CivicSpace trackback also features autodiscovery. If trackback autodisovery is enabled on your CivicSpace site, someone need only visit your post via a link from another weblog post to have trackback "discover" the linking site and create the trackback. Trackback autodiscovery also works internally within a CivicSpace site, automatically creating connections between pages which link to each other.
To manually send a ping to another site, edit your post and use the Trackback URL field at the bottom of the edit page to submit the trackback URL for the post on the other site. Once you enter submit, CivicSpace will ping the other site for you. With trackback autodiscovery enabled, your CivicSpace site will attempt to do this automatically without your intervention.