Aluminum is a versatile metal that is widely used in various industries due to its unique properties such as lightweight, corrosion resistance, and excellent electrical and thermal conductivity.

Here are some major applications and classifications of Aluminum:

1. Transportation: Aluminum is widely used in the transportation industry for making aircraft, automobiles, trains, and ships due to its lightweight and high strength-to-weight ratio. It helps in reducing fuel consumption and improving the overall efficiency of the vehicles.

2. Construction: Aluminum is widely used in the construction industry for making windows, doors, curtain walls, roofing, siding, and structural components due to its excellent corrosion resistance, durability, and low maintenance.

3. Packaging: Aluminum is widely used in the packaging industry for making cans, foils, and containers due to its excellent barrier properties, which protect the contents from moisture, light, and oxygen.

4. Electrical and Electronics: Aluminum is widely used in the electrical and electronic industry for making wiring, power transmission lines, and electronic components due to its excellent electrical conductivity and corrosion resistance.

5. Aerospace: Aluminum is the most commonly used material in the aerospace industry due to its high strength-to-weight ratio, corrosion resistance, and low density.

Classification of Aluminum:

1. Pure Aluminum: Pure aluminum has a purity of 99% or higher and is used in various applications where high corrosion resistance and excellent thermal and electrical conductivity are required.

2. Aluminum Alloys: Aluminum alloys are a mixture of aluminum and one or more other metals such as copper, zinc, manganese, or magnesium. They are used in various applications where high strength, durability, and toughness are required.

3. Cast Aluminum: Cast aluminum is produced by pouring molten aluminum into a mold and is widely used for making complex shapes and structures such as engine blocks, transmission cases, and other automotive components.

4. Extruded Aluminum: Extruded aluminum is produced by forcing heated aluminum through a die to produce complex shapes and is widely used for making window frames, doors, and other structural components.