A clean room or cleanroom is a room that is free from static or has a low level of dirt and dust particles or airborne chemicals. It can be used for multiple purposes, including research and development of new products like computer processors. The environment must be controlled to ensure the product is not damaged or contaminated. The picture is an example of two people in a clean room, one of them examining a silicon wafer.
When a person enters a clean room, they typically wear a special kind of clothing or suit that is static-free and thoroughly clean. Some clean room entry-ways include a small chamber that utilizes air or chemicals to cleanse the person before they enter the room. The clean room itself may also have special air filtration systems and duct work to ensure it remains clean and controlled.