Classifying video games according to suitability-related factors such as violent or sexual content contained within a game. Some countries use industry self-regulation models to accomplish this, while others have government rating boards. Certain content ratings result in products being legally or de facto banned from sale, such as the AO (adults only) rating in the United States. While legal, such titles are not stocked by retailers and will not be certified for release by major console makers such as Sony and Microsoft.
