Banned words list is the list of fragments of articles which you would like to permanently bar from your newsgroup. For example, if you never want articles mentioning 1-900 anywhere, you would put 1-900 into that list.

It can be a list like this

1-900
make money fast
XXX
That means that no message containing words 1-900, "make money fast", and "xxx" will ever be posted.

Of course, populating this list is a matter of your policy. However, I want to warn new moderators that banning words would also have the effect of preventing meta-discussions. For instance, someone suggesting that 1-900 should now be discussed would not be able to post this suggestion.