Aluminum wire is a type of electrical wire made from aluminum, a lightweight and corrosion-resistant metal. It is commonly used in various applications, including residential and commercial electrical systems, due to its good conductivity and lower cost compared to copper wire. One of the advantages of aluminum wire is its ability to carry electricity efficiently while being lighter than copper. However, it requires special connectors and installation techniques to ensure safety and performance, as aluminum can expand and contract more than copper when heated.