Evaporated milk is milk, either whole or skim, with about 60% of the water removed. It is then sterilized and canned. Evaporated milk has a somewhat cooked flavor.
Condensed milk is whole milk that has had about 60% of the water removed and is heavily sweetened with sugar. It is available canned and in bulk.
Dried whole milk is whole milk that has been dried to a powder. Nonfat dry milk is skim milk that has been dried in the same way. Both are available in regular form and in instant form, which dissolves in water more easily.