Networking - Technology
Firewall
A security barrier that allows or blocks internet and network traffic according to rules
What's it for?
Blocks unwanted network traffic so only approved connections can reach a computer or system.
For example…
A firewall blocks public access to the internal staff database
A firewall allows staff to reach the company website on HTTPS but blocks direct internet access to the internal database.
Think of it like…
A nightclub bouncer checking everyone against a defined dress code before deciding who is allowed in