Often gels are referred to as "shellac," but the two aren’t essentially interchangeable. Shellac is a trademark of CND, the creators of gel engineering. Visualize it a bit like “jacuzzi” and “hot tub,” the previous referring to some trademark manufacturer name as well as latter to some style of item. https://podcast-mic36740.pointblog.net/gel-remover-can-be-fun-for-anyone-71426836