Apple has officially released the latest version of its flagship macOS High Sierra, 10.13.4. This update, alongside implementing some useful small functionality (including enabling the use of Command+9 in Safari in order to reach the built-in browser's right-most currently open tab), has officially added compatibility with external graphics processing units (eGPUs) for use with more graphics-intensive tasks. These tasks can range anywhere from rendering in virtual reality to high quality graphics in gaming software.
Here's how Apple's official support page for High Sierra 10.13.4's external GPU support describes the pros of the functionality in bullet point form:
For more information on what this update adds, see Apple's official about page for macOS High Sierra 10.13.4.