Computer security: What is a firewall? How does it work? – Express

What does a firewall do?

A firewall acts as a gatekeeper, monitoring attempts to gain unauthorised access to an operating system and blocks unwanted traffic or unrecognised sources.

Firewalls are essentially a barrier between a computer and another network such as the internet.

They help protect your network and information by managing network traffic, blocking unsolicited incoming network traffic and validating access by assessing network traffic for anything malicious like hackers and malware.

Your operating system and your security software usually come with a pre-installed firewall.

Security experts recommend making sure those features are always active.

And users should always make sure security settings are configured to automatically run updates.


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