An airport consists of areas for aircraft to take off and land like runways, as well as additional structures and facilities. Airside areas include runways, taxiways, and ramps/aprons to move aircraft. Landside areas provide public transportation, access roads, and parking. Airports can be towered or non-towered, with towers controlling air traffic. Additional facilities include immigration and customs for people, along with pre-security and post-security zones, shops, lounges, and other passenger services.