Here's why:

* High Conductivity: Copper has excellent electrical conductivity, second only to silver.

* Cost-effectiveness: While silver is a better conductor, it's significantly more expensive. Copper offers a good balance of conductivity and affordability.

* Durability: Copper is a durable metal that can withstand various environmental conditions.

* Abundance: Copper is relatively abundant, making it readily available for widespread use.

While aluminum is also a good conductor and is sometimes used in specific applications, copper remains the most common choice for electrical wiring and other conductive applications.