Stainless Steel cookware is a poor conductor of heat however, it will not corrode. To solve the heat problem, some exceptionally creative designers and manufacturers around the globe managed to create stainless steel which delivers the heat capacity needed for even cooking.
These talented teams developed the idea of bonding stainless steel with other useful heat conducting metals such as aluminum and copper. The result was simply a beautiful stainless steel outer and inner finish with an aluminum or copper core bottom.
When shopping for stainless steel cookware, look for Tri-Ply layers of metals.