Sometimes gels are called "shellac," but The 2 aren’t essentially interchangeable. Shellac is usually a trademark of CND, the creators of gel know-how. Imagine it a bit like “jacuzzi” and “sizzling tub,” the former referring to a trademark model name plus the latter into a kind of product or service. https://bookmarkalexa.com/story3449423/everything-about-gel-remover