Here's why:

* Free Electrons: Aluminum has a large number of free electrons in its outer shell. These electrons are loosely bound and can easily move throughout the material when an electric potential is applied.

* High Conductivity: Aluminum has a relatively high electrical conductivity, making it an excellent material for conducting electricity.

While aluminum isn't as conductive as copper (the best conductor), it's still a very good conductor and is often used in electrical applications due to its lightweight and affordability.