First aid is a form of emergency medical care that is developed to be taught to non-professionals and paramedics in order to stabilize an injured or ill person until they can get proper medical care. It concentrates on preventing the loss of blood, stabilizing broken bones and ensuring the patient has sufficient oxygen. Advanced techniques, such as CPR, are even developed and taught to allow non-professionals to delay the consequences of a cardiac arrest.
Although first aid training is common, many volunteer organizations throughout the world such as the Red Cross and the St. John Ambulance give intense first aid training to volunteers. Such volunteers are often called in during disasters or are on hand for large public events and can deal with a large number of minor emergencies such as fainting, heat stroke or hypothermia.