Emergency services andrescue services^[1] are organizations that ensurepublic safety,security, andhealth by addressing and resolving differentemergencies. Some of these agencies exist solely for addressing certain types of emergencies, while others deal with ad hoc emergencies as part of their normal responsibilities. Many of these agencies engage in community awareness and prevention programs to help the public avoid, detect, and report emergencies effectively. Emergency services are often consideredfirst responders, and typically have dedicatedemergency vehicles.

Emergency services have one or more dedicatedemergency telephone numbers reserved for critical emergency calls. In many countries, one number is used for all of the emergency services (e.g.911 in many parts of theAmericas,999 in theUnited Kingdom,112 incontinental Europe,000 inAustralia). In some countries, each emergency service has its own emergency number (e.g. 110 for police, 118 for coast guard, 119 for fire and medical inJapan; 110 for police, 119 for fire, 120 for medical inChina). Calls made to emergency services to report emergencies are calledcalls for service.

The availability of emergency services depends very heavily on location, and may in some cases also rely on the recipient giving payment or holding suitable insurance or other surety for receiving the service.

Primary emergency services are emergency services that provide basic emergency assistance and care. They can be summoned directly by the public. There are three primary emergency services and they are listed in the following order.

• Police – These agencies providelaw enforcement,crime suppression and prevention,criminal investigation, and maintenance ofpublic order. There are a variety of similarlaw enforcement agencies such asgendarmerie, but police are the most common. Law enforcement agencies may differ in jurisdiction (federal police,state police,county police, (sheriff),municipal police,national police, etc.), specific role (highway patrol,special police, etc.), capabilities (auxiliary police,police tactical unit, etc.), and oversight (private police by private entities,military police by militaries, etc.), but generally share similar purposes.
• Fire departments – These agencies providefire suppression and protection,fire prevention,special operations and technical rescue response services, emergency medical response services andhazardous materials mitigation. They may be government organizations or private services.
• Emergency medical services – These agencies provideemergency medicine,patient transport, andtechnical rescue services. They may be government organizations, private services, or even charity-run, and may be their own independent service or part of another agency such as a fire department or health ministry.

Specialized emergency services are emergency services that are not considered one of the three primary emergency services. They can be provided by one of the primary emergency services (often as a division or unit) or by a separate governmental or private body.

Specialized emergency services may typically be contacted and requested by the public, unless they are a division or unit of a primary emergency service. They may also often be requested by primary emergency services to handle certain emergencies or augment existing emergency services personnel. Some of these services may be location-specific and have jurisdiction over specific areas or situations, with little if any authority outside them.

In some jurisdictions, specialized emergency services may be allowed to useemergency lights on their vehicles, often yellow or amber lights unless they are already part of a primary emergency service, in which case they typically use the emergency lighting configuration used by their respective emergency service.

• Animal control service – Animal assistance, ensuring public safety around animals
• Bomb squad – Bomb disposal, hazardous material disposal, weapons and munitions disposal
• Border guard – Border control, border security, border protection
• Bylaw enforcement – Enforcement of local ordinance
• Civil defense – Disaster protection, wartime civilian protection, rescue aid
• Coast guard – Maritime law enforcement and rescue within national waters
• Conservation officer – Wildlife protection, wildlife law enforcement, hunting and fishing enforcement
• Coroner – Death confirmation, cause of death identification
  • Medical examiner – Death investigation
• Emergency management – Incident management, coordination in major emergencies
• Firefighter – Rescue, fire suppression and prevention
• Humanitarian aid – Basic aid and care for people in need
• Incident response team – Specialized incident response
• Lifeguards – Medical aid and rescue at pools, beaches, shorelines, dive spots
• Military – National defense, internal security, emergency assistance (in certain situations and jurisdictions)
  • National Guard – Internal security
• Mobile Crisis – Mental health crisis response including evaluations, de-escalation, and referral to other services
• Paramedics – Medical aid, assistance and rescue of injured people
• Park rangers – Law enforcement in parks and nature reserves
• Poison control center – Advice on poison exposure
• Police officer – Law enforcement, crime suppression, protection of the general public
• Police tactical unit – Hostage rescue, counter-terrorism, dangerous situation resolution, combat
• Prison officer – Law enforcement and first response within correctional facilities
• Public utilities – Safeguarding and maintaining utilities and infrastructure
• Public works – Assessing, cleaning, and repairing infrastructure
• Roadside assistance – Aiding motorists in need of assistance, conducting vehicle maintenance and repairs
• Search and rescue – Rescue of missing, trapped, or at-risk victims
  • Avalanche rescue – Rescue of victims in avalanches
  • Cave rescue – Rescue of victims in caves and underground areas
  • Mountain rescue – Rescue of victims on mountains or in wilderness areas
  • Urban search and rescue – Rescue of victims in urban areas
• Security forces – Internal security
• Security guards – Asset protection, property protection, private enforcement
• Ski patrol – Medical aid and rescue at ski resorts and mountain resorts
• Tow truck – Moving disabled, impounded, or illegally-parked vehicles
• Wildland firefighting – Wildfire suppression

Effective emergency service management requires agencies from many different services to work closely together and to have open lines of communication. Most services do, or should, have procedures and liaisons in place to ensure this, although absence of these can be severely detrimental to good working. There can sometimes be tension between services for a number of other reasons, including professional versus voluntary crew members, or simply based on area or division. To aid effective communications, different services may share common practices and protocol for certain large-scale emergencies. In the UK, commonly used shared protocols includeCHALET andETHANE while in the US, theDepartment of Homeland Security has called for nationwide implementation of theNational Incident Management System (NIMS),^[2] of which theIncident Command System (ICS) is a part.^[3]

Smart Emergency Response System (SERS)^[4] prototype was built in the SmartAmerica Challenge 2013–2014,^[5] a United States government initiative. SERS was created by a team of nine organizations. The project was featured at the White House in June 2014 and called an exemplary achievement by Todd Park (U.S. Chief Technology Officer).

The SmartAmerica initiative challenges the participants to build cyber-physical systems as a glimpse of the future to save lives, create jobs, foster businesses, and improve the economy. SERS primarily saves lives. The system provides the survivors and the emergency personnel with information to locate and assist each other during a disaster. SERS allows organization to submit help requests to a MATLAB-based mission center connecting first responders, apps, search-and-rescue dogs, a 6-feet-tall humanoid, robots, drones, and autonomous aircraft and ground vehicles. The command and control center optimizes the available resources to serve every incoming requests and generates an action plan for the mission. The Wi-Fi network is created on the fly by the drones equipped with antennas. In addition, the autonomous rotorcrafts, planes, and ground vehicles are simulated with Simulink and visualized in a 3D environment (Google Earth) to unlock the ability to observe the operations on a mass scale.^[6]

A common measurement inbenchmarking the efficacy of emergency services is response time, the amount of time that it takes for emergency responders to arrive at the scene of an incident after the emergency response system was activated. Due to the nature of emergencies, fast response times are often a crucial component of the emergency service system.^[7]