Can you please help with a short steem lession to understand (NSFW) , Network Security FireWall !!!??

mbusomeshackq (41)in #steem • 7 years ago

When do I see it when it applies ?, is its automatic anti-spam detection
translation that always happen in my mind detailed below
N=Network
S=Security
F= Fire
W=Wall

especially the as it seems to associated with safety!!