Some species adopt a different strategy, imitating other organisms—most often harmless species resembling those capable of defence. This variation of mimicry, referred to as mimicry proper, is most frequently observed among insects, but also occurs in snakes and fish.

Camouflage is a protection technique widely employed in the natural environment and refined through millions of years of evolution. Initially, it was used primarily during hunting, allowing predators to approach prey undetected. Early forms relied on animal skins as well as elements of surrounding vegetation.

Human recognition of the undeniable advantages of camouflage emerged during the First World War. Early camouflage patterns were initially perceived by soldiers of the era as unusual and even absurd.

However, with the advancement of firearms technology—and the resulting increase in engagement distances—the use of camouflage-coloured uniforms became highly desirable. Beyond improving battlefield survivability, such uniforms also provide a strong identity effect, reinforcing a sense of group affiliation and distinction from other formations.

The use of simple camouflage colours provided concealment within the visible spectrum until the development of sensors and cameras operating in other regions of the electromagnetic spectrum. In the 1940s, photographic film specifically designed for camouflage detection was developed, sensitive to near-infrared radiation. The extensive development of digital sensors, beginning in the 1960s and continuing to the present day, has necessitated effective concealment across the entire electromagnetic spectrum. In addition to optical reconnaissance, significant progress has also been made in microwave (radar) detection technologies. All detection methods effectively complement the human eye in identifying anomalies within the environment.

Camouflage principles can be divided into several categories: tactical, operational, and strategic camouflage. Tactical camouflage, also referred to as direct camouflage, encompasses all measures aimed at concealing troops, combat equipment, and fortifications through the effective use of terrain features and available camouflage assets. The majority of camouflage measures operate primarily through colour-based concealment, involving changes to the colour of an object or its components. This is achieved through disruptive painting designed to provide protection to equipment or personnel within the specific environment for which the camouflage was developed.

Operational camouflage consists of a set of measures intended to protect operational activities by concealing critical assets such as command and control elements and preparations for military operations. Strategic camouflage includes coordinated actions designed to mislead the adversary’s highest command authorities regarding the actual state of defensive preparedness, intentions for military operations, the concealment of strategic assets, or the diversion of attention toward secondary or decoy targets.

Camouflage measures include natural camouflage (trees, shrubs, terrain features), technical camouflage (camouflage covers, mobile camouflage systems, camouflage paints, and individual camouflage equipment), dynamic camouflage (the use of smoke, fog, or position changes), electromagnetic camouflage (radio silence, signal jamming), and deceptive camouflage (decoy objects and simulated movement).

Camouflage—applied to both combat equipment and personnel—is a critical factor determining the effectiveness of military operations. The primary objective of camouflage systems is to minimise differences in the reflection characteristics of the electromagnetic radiation between the background and the concealed object, thereby making its detection and subsequent identification as difficult as possible.