TV parental controls exist so that parents can regulate what their children watch. Of course, such controls are also helpful for other guardians and institutions. For instance, schools and other areas with a family-friendly emphasis can also benefit from these features.
The different TV parental controls provide different functions. Some options may block out all undesirable programs or channels. Others may simply regulate when or how long the television can be used. In some situations it is also possible to simply filter out unwanted material within a movie, as opposed to blocking the entire film.
TV parental controls may be purchased in addition to your television. Some, like the V-chip, are built-in. The V-chip is a receiver which blocks content based on rating systems. Most televisions larger than 13 inches that were built since 1999 will include them. All those created after 2000 are required to have this technology.