A dehumidifier is a machine that helps dry out the air in a room. Imagine it like a big vacuum cleaner that sucks up all the extra moisture in the air.
When we breathe and sweat, our bodies give off moisture in the form of water vapor. When there's too much moisture in the air, it can feel like we're in a steamy sauna, which makes it harder for our bodies to cool down.
A dehumidifier helps fix this problem by pulling in damp air from the room and removing the moisture from it. It does this by passing the air over a cold coil that cools the air down, which causes the moisture to turn into water droplets. These droplets then collect in a tray or tank that needs to be emptied regularly.
The machine also puts dry air back out into the room, making it feel more comfortable and easier for our bodies to regulate temperature.
So, in short, a dehumidifier helps dry out the air in a room by sucking in damp air, removing the moisture from it, and then putting dry air back out into the room.