When you breathe onto a cold window and water droplets appear, it is an example of

Condensation

Explanation:

The water vapor in the air comes in contact with something cool. Say the cold glass of the window.

The molecules slow down and get together. The gaseous water molecules  turns back into water droplets.

This process is known as condensation. Breathing onto a cold window glass makes water droplets due to this process only.

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