High-gloss is the shiniest paint sheen, with a mirror-like reflectivity and a very hard surface. It’s the most durable and easiest to clean out of any sheen level, so it appears on trim, doors, and cabinets, where flaws would also show most.
Because it reflects so much light, high-gloss reads differently in every room depending on lighting and wall color. We usually test a small area first so you can see how the shine behaves in your space before it goes on the whole piece.