What is the meaning for ramparts?

Ramparts are defensive walls or barriers, typically surrounding a castle, fort, or city, designed to protect against attacks. They often feature a broad walkway for troops and can be built from various materials, such as stone or earth. Historically, ramparts played a crucial role in military architecture, providing both fortification and a vantage point for defenders. Today, the term can also metaphorically refer to any protective or defensive structure.