This is a 34-inch ultrawide — picture two regular monitors side by side minus the bezel gap in the middle. The curve wraps the edges toward you so the whole screen feels like one view instead of looking at a flat wall. Great for games where you want to feel inside the world, and useful for work if you're the type who keeps ten browser tabs open at once.
The 165Hz refresh (how smooth motion looks) is plenty fast for gaming without needing a monster graphics card to keep up. The VA panel gives you deeper blacks than most monitors, so dark scenes in games actually look dark instead of washed out. Pixel response is quick enough that you won't see blurry trails.
The HDR sticker on the box doesn't mean much in practice — treat this as a regular bright display and you'll be happy. The curve takes a day to adjust to if you've never used one, but most people stop noticing it fast.