Web filter definition
A web filter is a software tool that manages access to websites and other types of online content based on predefined rules. Businesses and schools may use web filtering for various reasons — from making networks more secure to boosting employee and student productivity. Web filtering may restrict access to all kinds of platforms, from social media networks to gambling sites.
See also: web content filtering
How web filters work
- 1.When you attempt to access a website or an online resource, your request is broken down into data packets sent over the internet.
- 2.Web filters use predefined criteria to review and check the data packet content. These rules can be based on URLs, keywords, IP addresses, and content type (e.g., adult content).
- 3.The web filter compares the content to its predefined rules. Based on these rules, it may allow the content to pass through, block it, redirect the user to a warning page, or log the activity).
- 4.Web filters need regular updates to stay effective — websites and content can change, with new threats or inappropriate content becoming a problem.
- 5.In some cases, web filters may integrate with user authentication systems, allowing organizations to apply different filtering rules to users or groups based on their permissions.
Web filter types
- URL filters may block websites based on their web addresses.
- Content filters analyze the content of web pages to determine if it should be allowed or blocked.
- DNS filters block access to specific domains at the DNS level.
- Application filters control access to specific web applications and services.
- Malware filters identify and block websites that are known sources of malware.
- Protocol filters control access to specific internet protocols or services.
- Behavioral filters analyze user behavior and identify potential harmful activity.
