A bastion is a projecting part of a fortification, typically designed to allow defensive fire in multiple directions. It is often shaped like a triangular or polygonal structure, providing soldiers with a strategic advantage against attackers. Bastions are commonly found in forts and castles, enhancing their defensive capabilities. Historically, bastions became prominent during the Renaissance period, as military architecture evolved to counter new artillery technology. They were integral to the design of many European fortifications, allowing defenders to cover blind spots and create a more effective defense against sieges.