An HDMI to DP (DisplayPort) adapter or cable is used to connect a device with an HDMI output (like a laptop, gaming console, or TV) to a DisplayPort input (on a monitor or other display device).

However, it’s important to note that HDMI and DisplayPort use different signaling technologies, and the conversion from HDMI (which is an active signal) to DisplayPort requires active adapters (those that require power, usually via USB). Simply using a passive adapter (which doesn't provide power) won't work, as the two protocols are not directly compatible.

Key Points:

1. Active Adapter: Needed to convert HDMI output to DisplayPort input.
2. Power: Some adapters may need external power (via USB or other methods) to work.
3. Resolution & Refresh Rate: The quality of the signal output may depend on the HDMI version (e.g., HDMI 1.4 vs 2.0), the DisplayPort version (e.g., DP 1.2 vs 1.4), and the specifications of the adapter.

For best results, ensure the adapter is designed to handle the resolution and refresh rate you desire (e.g., 4K at 60Hz, 1080p at higher refresh rates).