Sleet is a type of winter precipitation that occurs when raindrops freeze into ice pellets before reaching the ground. This happens when warm air is followed by a layer of cold air, causing the rain to freeze as it falls. Sleet can create slippery surfaces, making it hazardous for driving and walking. Unlike snow, which is fluffy and light, sleet is hard and can bounce when it hits the ground. It often forms during winter storms and can be mixed with other types of precipitation, such as snow or freezing rain. Understanding sleet helps people prepare for winter weather conditions.