The same way that the “steam” from your kettle evaporates into the surrounding air.
Clouds are just water vapour, the same as the “steam” from your kettle (steam and water vapour are technically different things). It’s just droplets of water. If the air around it allows it to dissipate, it’ll turn to smaller, more spread out droplets that are basically invisible.
Clouds are visible mainly because winds “push” the water vapour together and keep them together in a rough volume, but the edges are changing and moving all the time, in all 3 dimensions, it’s only kept together by air above, below and sideways keeping it pushed “together”.
When that push becomes uneven, the cloud will spread out and “disappear”, and those same droplets will either float around or fall down or may even be “pushed” to form a new cloud elsewhere later on.
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