Why do blacksmiths quench horseshoes?

Blacksmiths quench horseshoes to rapidly cool them after shaping, which helps to harden the metal and improve its durability. The process involves immersing the hot horseshoe in water or oil, creating a hardened surface that can withstand the wear and tear from the horse's movement. Quenching also helps to relieve internal stresses in the metal, ensuring that the horseshoe maintains its shape and strength under load.