Content filtering, one of the most popular security measures used in web security, is applied to users' e-mail and web access. The aim is to prevent content such as spam, viruses and malware from harming the systems by either e-mail or web access. With content filtering, it becomes possible to prevent users from accessing sites and applications that are not suitable for business purposes.

Content filtering tools are used to regulate the internet access of clients working in the corporate network, and they can prevent access to some sites when desired due to both security and corporate policy. If they work as a proxy while performing this function, it can also scan for malware on incoming traffic. Generally, this feature is preferred in conjunction with a Web Filtering or Load Balancer product.