What are clouds you see in a sunny day?

On a sunny day, the clouds often seen are typically cumulus clouds, which are fluffy, white clouds with a puffy appearance. They form when warm air rises and cools, leading to condensation of moisture. These clouds usually indicate fair weather, though larger cumulus clouds can develop into thunderstorms later in the day. Other types like cirrus clouds may also be present, appearing wispy and thin high in the sky.