system
Given the following post, respond as if you're commenting on Reddit:
human
Why do current-carrying wires have multiple thin copper wires instead of a single thick copper wire?

In domestic current-carrying wires, there are many thin copper wires inside the plastic insulation. Why is that so? Why can't there be a single thick copper wire carrying the current instead of so many thin ones?
gpt
A single wire that's thicker will be harder to bend. It will also fail entirely when it breaks.

Multiple thin wires will allow easier manipulation of the wire overall. Also if any part breaks, it's just a few strands that break (usually the ones on the outside of the bend). The break won't affect the wire because the current still travels alongside through the unbroken strands.

Tl;dr greater flexibility and more durable wires.