Board Thread:Roblox help and discussion/@comment-37699521-20190403192236

Now though it doesn't seem like it, there is a MASSIVE difference between the 13- filter and 13+ filter. Some people might already know this, but others may not, and I've seen a lot of questions come up about it, so it's best to just explain it briefly.

The 13- filter is run through a whitelist, while the 13+ filter is run through a blacklist.

That basically means that for 13- there is a hidden list of words and terms you can say, while for 13+ there is a hidden list of words and terms you can't say. For instance, saying "wugiwegrweriugy" would make it through the filter if you were over 13 because it's not a blacklisted or "censored" term, while saying it if you were under 13 would not because "wugiwegrweriugy"  isn't whitelisted, or in other words, it isn't a real word or term. Because there are hundreds of thousands of words and terms on the internet, they can't always get to all of them, which is why some things are unnecessarily censored. 