Great Firewall

The Great Firewall of China is a combination of legislative actions and technologies enforced by the People's Republic of China to regulate the Internet domestically. It operates by checking TCP packets for keywords or sensitive words and blocks access to selected foreign websites and slows down cross-border internet traffic. The Great Firewall has a significant impact on China's internet economy, giving preference to domestic companies and reducing the effectiveness of products from foreign internet companies. It is technically operated by the Cyberspace Administration of China (CAC) since 2013. The Great Firewall affects the Special Administrative Regions (SARs) of Hong Kong and Macau, but they have their own governmental and legal systems and enjoy a higher degree of autonomy.learn more on wikipedia