According to the author, "There are many ways to block bad websites and unwanted content. I break this guide into three different ways to prevent your PC from being infected by accidentally visiting a malicious or compromised website: (1) programs and tips that help prevent your PC from being a target for malware. (2) Programs that alert you to potentially malicious websites when they appear -- the self-censorship or "just change the channel approach". (3) Programs that filter unwanted content/websites from appearing -- the censorship approach"