Content filtering refers to the process of selectively screening and controlling the information that is accessible to users on the internet or within a specific network. This can be done through various methods such as keyword filtering, URL filtering, and file type filtering, to restrict access to certain websites, online content, or types of files. The purpose of content filtering is to protect users from inappropriate or harmful content, as well as to manage and regulate the flow of information within a network. It is commonly used in schools, workplaces, and homes to ensure a safe and productive online experience.