The adapter allows you to connect anything using a full-size DisplayPort cable to a USB punch in-C equipment.

Related:Should You Use HDMI, DisplayPort, or USB-C for a 4K Monitor?

Cable Matters USB C to DisplayPort 1.4 Adapter

31sCNPIIvdL.<em>SL500</em>

This adapter allows you to use DisplayPort-compatible monitors over USB Type-C. You still need a double-ended DisplayPort cable, though.