Induction heating only provides heat when in contact with the proper cookware. I will only heat the cookware you place on the burner (which must to be induction compatible). This is a wonderful safety feature to prevent burning oneself. Remember though that the contents you put in the pan will be hot!
Induction cooktops provide instant heat like gas stoves, but also provides the safety of no flame. An induction cooker is faster and more energy efficient that an electric stove top.
Induction heating heats only the pot (and in turn, the contents of the pot).
Cookware must have a flat bottom and must be compatible with induction heating; glass and ceramics are unusable, as are solid copper or solid aluminum cookware for most models of cooker.