Back in the early 70s and 80’s, programmers can program whatever games they liked. But when they get matured, there are a lot of games developed by these programmers are not suitable for kids. There are a lot of battle happened and at the end, Entertainment Software Rating Board (ESRB) is born. ESRB will assign age and content ratings for video game and also mobile apps. They will enforce advertising and marketing guideline for the video game industry. The following video shows the timeline and the reason ESRB rating system for games is needed at the first place.