If there is a small fire, a strong gust of wind, or air, can put it out. This is because the flame and heat from a fire are the result of burning gases, and a blast of air can keep the flame away from the fuel, so that it dies down. At the same time, a fire needs oxygen to burn. Air contains oxygen, so if you deprive a fire of air, it will be extinguished.
You must have also seen how wind can fan a fire so that it burns more fiercely and faster. This is because more oxygen is being supplied by the wind, and this feeds the flames. So, air can do two contrasting things- it can kill a flame, and feed it too. isn't that amazing ?
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