A cufflink (also cuff link or cuff-link) is a decorative fastener worn by men or women to fasten the two sides of the cuff on a dress shirt or blouse.
Cufflinks are designed only for use with link cuffs (also known as French Cuffs or double cuffs), which have buttonholes on both sides but no buttons. These may be either single or double-length (“French”) cuffs, and may be worn either “kissing,” with the ends pinched together, or “barrel-style,” with one end overlapping the other. We usually recommend kissing cuffs.
Cufflink designs vary widely. The simplest design consists of a short post or chain connecting two disc-shaped parts. The part positioned on the most visible side is usually larger; a variety of designs can connect the smaller piece: It may be small enough to fit through the button hole like a button would; it may be separated and attached from the other side; or it may have a portion that swivels on the central post, aligning with the post while the link is threaded through the button-hole and swiveling into a position at right angles to the post when worn.
The visible part of a cufflink is sometimes monogrammed and often decorated in some way. There are numerous styles including novelty cufflinks, traditional cufflinks, contemporary cufflinks and humorous cufflinks.