The illegal arms trade encompasses the illicit transfer, sale, and circulation of firearms, ammunition, and other military-grade weaponry. These weapons range from small arms and light weapons to heavy artillery and missile systems. The sources of these illicit arms are diverse, including stolen weapons, surplus military stock, and unauthorized production in unregulated regions. Sophisticated smuggling networks exploit loopholes in border controls, corrupt officials, and weak regulatory systems, enabling the illicit arms trade to thrive.