Here's why:

* High Conductivity: Copper has excellent electrical conductivity, meaning it allows electricity to flow through it easily.

* Abundance and Cost: Copper is relatively abundant and affordable compared to other highly conductive metals.

* Ductility: Copper is very ductile, which means it can be drawn into thin wires without breaking.

* Corrosion Resistance: Copper is relatively resistant to corrosion, which helps ensure the long-term performance of wires.

While other metals like silver and gold are even better conductors than copper, they are too expensive for widespread use in everyday wiring. Aluminum is also used in some electrical applications, but it has lower conductivity and is less ductile than copper.