“The cuff link is a decorative faster worn on the cuff of a shirt or a blouse.” Wikipedia
And thought this might be a really simple definition, many don’t know how to wear one properly. Cuff links come in silk knots, double panels and swivel bar types of which the latter is the most common.
The video on how to wear your cufflinks is short, no need wasting your time with a lengthy video on a really simple matter. Enjoy. Learn.