Handfasting is a betrothal or wedding ritual in which the couple's clasped hands are tied together by a cord or ribbon (s) — hence the phrase "tying the knot".
"Handfasting" was the word used by the ancient Celts/Pagans to describe their traditional trial-marriage ceremony, during which couples were literally bound together. The handfasting was a temporary agreement, that expired after a year and a day. However, it could be made permanent after at that time, if both spouses agreed.

This is just a brief description of the ritual we're choosing to include in our wedding ceremony. There is much more information available on-line, of course, in addition to other sources. Feel free to chat us up about it as we are keen to share our insight and views. Remember, too, that Susan performs such rites as The Reverend SuZen [TM] www.revsuzen.com and is fairly knowledgeable with its lore and procedure.