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The latest MacBooks only have two USB C ports. By using hubs that are compatible with USB C ports, Mac users can enjoy the following advantages that non-Mac users benefit from.
If you want to take full advantage of the fast charging function of your new USB-C devices, you will need to get a USB-C PD (Power Delivery) cable which has the Power Delivery protocol.
If you need to add multiple peripherals like flash drives, printers, Ethernet, a display, that you already own into your new USB-C devices, a USB-C hub will let you hook them all up at one time.