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Stop all your browsers, apps and operating systems from visiting malicious, online trackers, or otherwise unwanted websites.
Easy way to block websites I don't want my employees to visit wherever they are.
Pros: Easy to block predefined sets of large domains hosting malware or track user activity while browsing.
I also like the many ways to block websites I specify myself, including all websites in some countries I never want my system to contact anyway.
Overall: Less malware, no more online user tracking, blocking domains in countries with a high security risk for malware and phishing activity.