The Great Firewall refers to China's extensive internet censorship and surveillance system. It restricts access to foreign websites and monitors online activities to control the flow of information. This system blocks popular platforms like Facebook, Twitter, and Google, while promoting domestic alternatives. The Great Firewall is part of China's broader strategy to maintain social stability and promote its political ideology. It employs various techniques, including IP blocking, keyword filtering, and deep packet inspection, to enforce these restrictions. This has significant implications for freedom of expression and access to information within the country.