Sometimes gels are called "shellac," but The 2 aren’t necessarily interchangeable. Shellac is actually a trademark of CND, the creators of gel technological innovation. Think of it somewhat like “jacuzzi” and “hot tub,” the former referring to some trademark brand name along with the latter to the form of solution. https://royalbookmarking.com/story18044104/the-smart-trick-of-gel-remover-that-nobody-is-discussing