A paramilitary is an organization whose structure, tactics, training, subculture, and (often) function are similar to those of a professional military, but which is not part of a country's official or legitimate armed forces. Paramilitary units carry out duties that a country's military or police forces are unable or unwilling to handle. Other organizations may be considered paramilitaries by structure alone, despite being unarmed or lacking a combat role.
Though a paramilitary is, by definition, not a military, it is usually equivalent to a special forces or commando in terms of strength, firepower, and organizational structure. Paramilitaries use "military" equipment (such as long guns and armored personnel carriers; usually military surplus resources), skills (such as battlefield medicine and bomb disposal), and tactics (such as urban warfare and close-quarters combat) that are compatible with their purpose, often combining them with skills from other relevant fields such as law enforcement or search and rescue. They rarely use extensive military equipment such as artillery and armed military aircraft.
In peacetime, paramilitaries are often assigned to protect high-profile sites, such as government facilities, infrastructure, airports, seaports, or borders. They may also be tasked with roles of VIP protection or counterterrorism. Depending on the organization the paramilitary operates under, they may also be reassigned until they are needed again; for example, members of a police tactical unit may be assigned to standard patrol duties until requested.
A paramilitary may fall under the command of a military, train alongside them, or have permission to use their resources, despite not actually being part of them. In some instances, paramilitaries may train members of an actual military in tactics they specialize in, such as arrest procedures.
Under the law of war, a state may incorporate a paramilitary organization or armed agency (such as a law enforcement agency or a private volunteer militia) into its combatant armed forces.