Radar Cross Section (RCS) is a fundamental concept in radar and defense technologies that defines how detectable an object is by radar systems. It represents the amount of radar energy reflected back to the radar source by a target. In simple terms, RCS explains how large or small an object appears to a radar, regardless of its actual physical size. This makes it a decisive factor in modern military aviation, missile systems, and unmanned platforms.

From a technical perspective, RCS is measured in square meters (m²) and varies depending on several factors such as the object’s shape, surface material, coating, and the angle at which radar waves strike it. Advanced stealth designs use special geometries, radar-absorbing materials, and smooth surface transitions to scatter or absorb radar waves, significantly reducing the RCS value. As a result, aircraft or missiles with low RCS can appear much smaller on radar screens, increasing survivability and operational advantage in modern warfare environments.