You can connect an external display, a projector, or an HDTV to ports on your iMac that support video output.
Connect one external display (up to 6K), a projector, or an HDTV to one of the two Thunderbolt / USB 4 ports Adapters for the Thunderbolt 4, Thunderbolt 3, or USB-C port on your Mac.
To connect this device
Use this cable or adapter
Apple Pro Display XDR
Thunderbolt 3 (USB-C) cable
Thunderbolt 3 (USB-C) display
USB-C display
USB-C (USB 3.1) cable
Thunderbolt 2 display
Thunderbolt 3 (USB-C) to Thunderbolt 2 adapter
HDMI display or HDTV
USB-C to HDMI adapter or a USB-C Digital AV Multiport adapter. If your iMac has an HDMI port, use User HDMI cable for a direct connection.
VGA display or projector
USB-C VGA Multiport adapter
DisplayPort or Mini DisplayPort display
USB-C to DisplayPort or Mini DisplayPort adapter
DVI display or projector
USB-C to DVI adapter
Adjust and arrange displays. After you connect an external display or projector, use Displays settings in Get help with video issues on external displays connected to your Mac.