A stock pot is a very large and deep cooking vessel generally used on top of a range for making stock or soup.
Stock pots can be made of a variety of materials, like aluminium and stainless steel, As with all pans the heavier the gauge of the metal the better (especially at the base); it enables more even heat distribution, which makes sticking and burning less likely. Some stock pots have a thick sheet of thermally conductive aluminium laminated into their base for that purpose (like the one shown). A coating of copper on the base allegedly has the same effect, but it would need to be reasonably thick to have any real benefit. They can also contain copper, and carbon steel. Pasta is an example of food that could be cooked in these pots.