A 关键字过滤器, or keyword filter, is a tool used to block or filter out specific words or phrases from online content.
敏感词 (mǐngǎn cí): This term refers to sensitive words or keywords that are often targeted by keyword filters for censorship purposes.
网络监控 (wǎngluò jiānkòng): This term means "internet surveillance" and refers to the monitoring and tracking of online activities.
信息审查 (xìnxī shěnchá): This term specifically refers to the process of reviewing and censoring information, often done through keyword filters.