This is a Type C OTG Adapter. It has USB Type C Male to USB 3.0/2.0 Type A female connections. Specially designed to provide backward compatible data transfer and power charging.
What is OTG?
USB OTG (USB On The Go) is a standard that enables mobile devices to talk to one another. Traditionally mobile devices could only connect to a Mac/PC by USB, but USB OTG makes it possible for devices to connect directly to each other.
And that’s not all USB OTG can do. By enabling your device to act as a USB host – that is, to be the boss of other devices that you connect to it – you can use additional hardware such as storage, keyboards or even musical instruments together with your handset.
2.0 = Good for connect peripherals, like a keyboard or mouse
3.0 = Good for transferring data, like usb flash drives.