What is a fire wall and how does it work

Firewalls are software or hardware that work as a filtration system for the data attempting to enter your computer or network. Firewalls scan packets for malicious code or attack vectors that have already been identified as established threats

Explanation:

Firewalls are software or hardware that work as a filtration system for the data attempting to enter your computer or network. Firewalls scan packets for malicious code or attack vectors that have already been identified as established threats.They are useful to protect and keep your data secured and safe.They can detect hacker id's and won't let them access your data with passwords.Hope this answer helps