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Pourbaix diagram of aqueous iron. Outside chemistry, ferrous is an adjective used to indicate the presence of iron. The word is derived from the Latin word ferrum (iron). Ferrous metals include steel and pig iron (with a carbon content of a few percent) and alloys of iron with other metals (such as stainless steel).
A non-ferrous metal is any metal that does not contain iron. Most of the time non-ferrous metals are a non-magnetic metal. If a magnet does not pull to the metal you are testing, it is a probably a non-ferrous metal. Non-ferrous metals are more valuable than ferrous metals and should be separated to get the most return for your metal. A couple of popular non-ferrous metals are copper, brass, and aluminum.