VRR (variable refresh rate)
Also searched as: vrr · variable refresh rate · adaptive sync
What it means
Normally your monitor refreshes on a fixed metronome and your frames arrive whenever they're ready — when those don't line up you get tearing or stutter. VRR lets the monitor wait for each frame, so it draws them the instant they land.
More detail
G-Sync (NVIDIA) and FreeSync (AMD) are the two brand names for it. It's the single biggest jump in how smooth a game feels, and it costs you nothing once your panel supports it. It works inside a range of frame rates, which is why capping your FPS to stay in that range matters.
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