What allows the computer to play youtube videos?

Question

Not necessarily youtube videos but what allows the computer to play videos from websites in general? My younger siblings have been misusing the privilege to use the internet. Recently, I have notice alot of p**n website in the history archive immediately after they have gotten of the computer. I have also notice alot of these websites are like youtube where the videos are uploaded by regular users. I would like to remove whatever software/hardware from the computer that allows these types of videos to function properly.

Answer 1

Youtube uses Macromedia Flash player to playback video.

Answer 2

you can try blocking the site in your options if that doesn't work try removing the multimedia player  

Answer 3

Macromedia flash player. Just uninstall it or use K9 Web Protection.