Differentiate the processes annealing and hardening.

Explanation

Annealing: It is a process to free steel from internal stress. The steel is heated to bright red heat and then gradually cooled. The restultant steel is soft and pliable.
Hardening: By this process steel can be made more hard and brittle. Steel is heated to bright red heat and then immersed in cold water. The restultant steel is hard and brittle glass.