+A **defense system** is an organized framework designed to protect against threats or incursions. It can manifest as physical structures, advanced technology, or coordinated strategies, all aiming to uphold [Security](/wiki/security) and prevent damage. From biological immune responses to global [Missile Defense](/wiki/missile_defense) networks, these systems fundamentally serve as a protective barrier.
+## See also
+- [Cybersecurity](/wiki/cybersecurity)
+- [Fortification](/wiki/fortification)
+- [Protection](/wiki/protection)
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