Radiatori are like tiny little ribbed pipes that are used to heat up homes. Imagine you have a bunch of straws lined up next to each other. Radiators look kind of like that, but instead of being one straight tube, they are made up of lots of little tubes all stuck together.
When you turn on the heat in your house, hot water flows through these tubes inside the radiators. The water travels through the tubes, and as it does, it gives off heat that warms up the room. Radiators are great because they can heat up a room quickly and evenly.
Sometimes, you might hear radiators making funny noises. That's because air can build up inside the tubes, making them gurgle or hiss. When that happens, you might need to bleed the radiator. Bleeding the radiator means letting the air out and allowing the water to move freely again.
Overall, radiators are just like little heaters that make our homes warm and cozy.