Parents typically want to make sure that their kids do not stumble across any adult content on the websites they browse, so they resort to parental control software or install dedicated porn blockers.
Some of these tools are browser extensions that filter out any inappropriate content, including advertisements, thus making them safe for children.
Other such utilities are standalone applications that block out adult websites based on pre-defined keywords.
Most of these blockers can also be customized to include user-specified websites to ensure better protection for youngsters.