system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: What is different about the insides of wires that transmit power (Charger), data (Aux, Ethernet), or both (USB-C)?

Basically what is inside that allows wires to transfer only energy, only data, or both?
gpt
It's more about the connections between the two ends of the cord.  Cords that are only for power only have connections at the pins that carry power, so a power only cord will have less individual wires inside it than one that can transfer power and data.  That's why the power only cords are generally cheaper.  They also don't have to conform to the data speed standards that data cords have to conform to.