An air cooler is like a big, cold fan that blows air to help cool down a room. It works by pulling hot air from the room through a wet pad or filter, which cools down the air before blowing it back out. Imagine taking a hot breath and then blowing on it with a wet mouth - that makes the breath feel cooler!
The air cooler also has a water tank that you fill up with water. The water is used to wet the pad or filter, which is what cools down the air. It's like having a big cup of water next to you on a hot day - when you drink it, you feel cooler because the water cools down your body inside.
Some air coolers can also have ice added to the water tank, which makes the air even colder. It's like putting ice cubes in your drink on a hot day - the drink gets even colder and feels really refreshing.
Overall, an air cooler is a great way to cool down a room without using as much energy as an air conditioner. It's also a bit safer for the environment because it doesn't use harmful chemicals like some air conditioners do.