Web-filtering software has two main customer bases: Parents who wish to prevent their children from accessing content they consider undesirable or inappropriate, and businesses that want to prevent employees from accessing websites that don’t pertain to their jobs. Web filters are also commonly used as prevention tool for malware, as the filters will block access to sites that commonly host malware, such as those related to pornography or gambling. The most advanced filters can even block information that’s sent out over the Internet, to ensure that sensitive data isn’t released.
There are ways around web-filtering software, such as using a Web-based proxy, using foreign-language websites or creating a VPN to a personal proxy server. Because of these loopholes, network admins or concerned parents have to ensure that their chosen filter can do more than just block or allow certain websites.