Perimeter security corresponds to the integration of elements and systems, both electronic[1]​ and mechanical, for the protection of physical perimeters, detection of intrusion attempts and/or deterrence of intruders in especially sensitive facilities. Among these systems, tactical radars, video sensors, sensorized fences, sensor cables, microwave and infrared barriers, concertina, etc. stand out.

Perimeter security systems can be classified according to the geometry of their coverage (volumetric, superficial "Surface (mathematical)"), linear, etc.), according to the physical principle of action (fiber optic cable, radio frequency cable, pressure cable, microphone cable, electrified fence, etc.) or by the support system (self-supporting, supported, buried, visual detection, etc.).

They are also classified depending on the means of detection:

Its main application corresponds to National Security (military and government facilities, borders, airports, etc.) and high-risk private facilities (nuclear power plants, corporate headquarters, VIP residences, etc.).