Blacksmithing is a craft involving the processing of iron and steel using hammers and anvils. The document discusses the history of blacksmithing, noting it was one of the most common medieval trades, with blacksmiths producing necessary tools. Blacksmithing required considerable skill and knowledge to process raw materials through techniques like welding and hardening. The anvil and hammer are also described as essential tools, with the anvil needing to be hard yet flexible to shape metal without damage.