How does URL blocking work?
URL filtering blocks URLs from loading, or only allows certain URLs to load, on a company network. If a user attempts to reach a blocked URL, they are redirected to a "blocked" page. URL filtering bases its filtering policies on a database that classifies URLs by topic and by "blocked" or "allowed" status.
How does URL filtering know which websites to block?
URL filtering relies on filtering databases that classify URLs by topic; each topic in this system is either “blocked” or “allowed.” This system was largely developed for productivity reasons, allowing employers to block websites that were inappropriate for work or that were designed to waste time.