Clouds look soft, like cotton in the sky. But clouds are not made of cotton. They are made of very small water droplets or ice crystals.
Warm air can hold water vapor. When that air rises and gets cold, the vapor becomes tiny drops. Many drops together make a cloud we can see.
Clouds have many shapes. Low clouds may look big and white. High clouds may look thin and light. Watching clouds is a simple way to think about the weather.