Web Content Filtering

NIST describes web content filtering as a program that prevents access to undesirable web sites, typically by comparing a requested website address to a list of known bad websites.(Source)

The Department of Homeland Security states that web content filtering (WCF) provides protection at the application layer for web traffic by blocking access to suspicious websites, preventing malware from running on systems and networks, and detecting and blocking phishing attempts as well as malicious web content. Sites that are new, not categorized, or have not been reviewed by an accredited WCF service pose an increased risk to organizations and their networks. (Source)