Flan moulds are moulds for making the Spanish-style dessert flan of custard and caramel sauce. The moulds come in various sizes and are made from various materials. Oval ones with tall sides are made of aluminum; you improvise covers with tin foil. Stainless steel ones tend to be round, and have lids that you latch on….
A flan pan is a round, shallow cake pan. The bottoms may be flat or raised, fixed or false bottoms that detach. The edges are frequently but not always fluted.