Why does keeping a warm drink covered make it stay warmed?

Keeping a warm drink covered helps retain its heat by reducing heat loss through evaporation and convection. When a drink is covered, it traps heat and moisture, preventing the cooler air from directly interacting with the surface of the liquid. This insulation slows down the cooling process, allowing the drink to stay warm for a longer period. Additionally, a lid can help minimize heat loss by reducing the surface area exposed to the surrounding air.