Use Adapters with your iMac
The following Apple adapters are available to connect external devices, displays, and more to the Thunderbolt 3 (USB-C) ports on your iMac.
Thunderbolt 3 (USB-C) to Thunderbolt 2 Adapter: Connect your iMac to Thunderbolt 2 devices or a Thunderbolt display.
USB-C Digital AV Multiport Adapter: Connect your iMac to an HDMI display, while also connecting a standard USB device to your iMac.
USB-C VGA Multiport Adapter: Connect your iMac to a VGA projector or display, while also connecting a standard USB device to your iMac.
Learn more. See the Apple Support article Adapters for the Thunderbolt 3 or USB-C port on your Mac or iPad Pro.
Adapters and other accessories are sold separately. Visit apple.com, your local Apple Store, or other resellers for more information and availability. Review the documentation or check with the manufacturer to make sure you choose the right product.