In Zwift there are numerous sprint and KOM segments. When you want to plan a route that targets a specific sprint or KOM you can show them on the map so you don’t have to remember where they are. By clicking the “Show KOMs” / “Show Sprints” checkbox in the menu bar, these segments will apear on the map:

Screenshot of Route Builder showing KOM and sprint segments on the map

Sprints are highlighted in purple, KOMs are highlighted in orange. For both segment types the start and finish markers are shown which help you see the direction of the segment.