What is the difference between UpFront Plus, Premium, Exit Row, Preferred, and Standard seating?

UpFront Plus offers seating near the front of the aircraft with extra legroom and an empty middle seat.
Premium offers extra legroom for added comfort.
Exit Row: A seat located in an emergency exit row, offering additional legroom. Passengers seated in an exit row must meet applicable safety requirements.
Preferred offers a designated seat location for added convenience closer to the front of the aircraft.
Standard includes all remaining seats that are not UpFront Plus, Premium, or Preferred.