Flat and matte
Hides wall flaws and looks soft. Best for ceilings and low-traffic rooms like bedrooms. Harder to scrub.
Eggshell and satin
A slight sheen that wipes clean. A good default for living rooms, hallways and kids' rooms.
Semi-gloss
Tough and washable. Use it on trim, doors, cabinets, kitchens and bathrooms where moisture and fingerprints happen.
Test before you commit
Paint a large sample on two walls and look at it in morning and evening light. Colors shift a lot between the store and your room.
General information only, not legal or professional advice.