It's a type of web filtering that uses a software to block online content that a parent classifies as mature, objectionable, or unacceptable to be seen by children for moral, religious, or any other reason. Their purpose is to prevent the child to access information or to download media that the parent classifies s unsuitable. It also serves as management tool for assigning online curfews.
The same disadvantages intenet filters of either overblocking or undeblocking applies. While it's most effective on small children, it's almost useless with older children and adolescents because of the many ways to bypass the sofware capabilities. one of the most used methods is by using proxy sites.
Source
Wikipedia - Internet Parental Control Software
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