Final answer:
Covering food in a microwave is common practice to prevent splattering, contain steam, and potentially reduce cooking time.
Step-by-step explanation:
It is common practice to cover food when cooking it in a microwave primarily to prevent splattering. When food is heated in the microwave, the moisture within it can rapidly turn into steam. If the food is not covered, this sudden steam release can cause the food to splatter inside the microwave, making a mess that can be difficult to clean. Covering the food with a microwave-safe lid or covering helps to contain the steam and minimize splattering. Additionally, this practice can also help to trap heat around the food, which can lead to more even cooking and potentially reduces cooking time.