Metallurgy is the branch of science and engineering that studies metals—their properties, how to extract them from ores, how to refine them, and how to shape and treat them to get desired characteristics (like strength, hardness, resistance to corrosion, etc.).

Broadly, metallurgy has three main areas:

1. Physical Metallurgy

- Focuses on the structure of metals (grains, phases, defects) and how heat treatment, alloying, and mechanical working change their properties.

- Example: Making steel harder by quenching and tempering.

2. Extractive Metallurgy

- Deals with extracting metals from their ores and refining them.

- Includes processes like roasting, smelting, leaching, and electrolysis.

- Example: Extracting aluminium from bauxite using the Hall–Héroult process.

3. Mechanical/Process Metallurgy

- Concerned with shaping metals into useful products through rolling, forging, casting, welding, etc.

- Example: Rolling steel into sheets for automobiles.

Metallurgy is fundamental to industries like construction, automotive, aerospace, electronics, energy, and also has important links with materials science.

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