In some cases gels are called "shellac," but The 2 aren’t automatically interchangeable. Shellac is really a trademark of CND, the creators of gel technology. Imagine it a tad like “jacuzzi” and “sizzling tub,” the previous referring to the trademark brand name plus the latter to some style of product. https://karlz333oyh4.laowaiblog.com/29134175/what-does-nail-gel-remover-mean