system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why are some USB cables better at charging than others?

So if USB stands for universal serial bus, that, to me, means there is only one stream of charge, however some cables are significantly faster than others. Is this due to the width of the cable? Or quality of the material in the cable?
gpt
USB cables contain power lines and signal lines. Some very cheap cables don't contain signal lines, so the charger and device can't talk to each other and negotiate the supply power. In addition to this, for higher power levels the cables contain a chip, this signals to the attached devices how much current and voltage can safely flow through the cable. 

Without this chip, charging will default to 5v 1.5A (or lower).