MFI Certified Cables

Aftermarket cables are not an exact match like the cable that came with the device.

These cables have a chip in them that Apple designs to make the device work with a charger or when syncing to a computer.

Besides the fact that these companies are certified by Apple, they are usually cheaper then buy genuine Apple cables.

This link will show what manufacturers are certified by Apple. https://mfi.apple.com/MFiWeb/getAPS

This link will show the differences between a counterfeit and a certified cable. https://support.apple.com/en-us/HT204566