Emergency medical services (EMS), also known as ambulance services or paramedic services, are agencies that deal with medical emergencies, mostly by sending ambulances to help people who are severely ill or injured. Their job is to treat those people at the scene and to take them to a hospital if needed. The staff of the ambulances are known most often as paramedics. Some ambulances have staff with more basic training, known as "emergency medical technicians", while others have doctors with advanced training.