Here's why:

* Conductivity: Copper is an excellent conductor of electricity. It allows the electrical current to flow efficiently from the charger to your phone.

* Cost-effectiveness: Compared to other conductive materials like silver or gold, copper is relatively inexpensive.

* Durability: Copper is a durable metal, able to withstand the wear and tear of repeated use and bending.

While some chargers might use other materials for specific parts, copper is the primary conductor used in the wires within most phone chargers.