A cleanroom is a special room that is super-duper clean. Think of it like a room that is so clean that even the tiniest bits of dust or dirt can't be in there. It is usually used for making things that need to be super clean, like computer chips, medicine, or even astronaut space suits.
To keep the cleanroom so clean, people who go inside need to wear special clothes that cover their entire body, even their hair, shoes, and face. These clothes are called "bunny suits," just like what a cartoon rabbit might wear.
Cleanrooms also have special air filters that clean the air and remove things like tiny particles or germs that might make it dirty. The air in a cleanroom is carefully controlled to make sure it's always clean and safe.
When things are made in a cleanroom, they need to be made extra carefully, because even the tiniest mistake could cause dirt or particles to get into the product and ruin it. That's why people who work in cleanrooms are specially trained to be extra careful and pay attention to every little detail.
Overall, cleanrooms are like super-clean and special rooms where people make very important things that need to be perfect and free from any dirt or particles.