There are many reasons to cover stove burners. They prevent food from falling underneath the burners,and add a decorative touch to your kitchen. Covers on stove burners also keep dust from collecting and provide a level surface to place objects on while using the stove.
Food that falls underneath a burner not in use can cause a fire issue when that burner is used later on. Additionally, in case of food spillage or splatter, burner covers are much easier to clean than burners. Depending on the time of year, you can use festive printed covers that coordinate with holidays and seasons.