For cookware to work on an induction surface, it must be magnetic and have a completely flat bottom. In general, most stainless steel and cast iron cookware will work. Here's a simple test: Try sticking a magnet to the bottom of your pan. If the magnet sticks, that cookware should work; if it doesn’t, most likely the cookware is not compatible with an induction cooktop surface.
Cookware made of aluminum, copper, or glass is not compatible with an induction cooktop. In addition, some types of stainless steel may not work on an induction surface, or may heat very slowly.