Historically, weapon design has shifted from simple stone tools to sophisticated weapon systems that integrate mechanical and electrical components, such as warships and fighter aircraft. Modern military training also emphasizes that the "real weapon" is the trained soldier, with physical tools serving merely as extensions of their capability.

: In many jurisdictions, certain classes of weapons—like automatic firearms —are strictly regulated or prohibited for civilian use.

: Includes nuclear, biological, and chemical weapons. Legal and Social Perspectives

: Article 36 of Additional Protocol I of the Geneva Conventions requires states to conduct legal reviews of new weapons to ensure they do not violate international law, a process that is increasingly complex with the rise of autonomous and AI-driven systems.

The development and use of weaponry are heavily regulated by both domestic and international law: