Hello Ajit,

Function of Firewall:

It is defined as a network security device which monitors network traffic of outgoing and incoming traffic and will decide whether to allow or to block that specific traffic as per the security noms.

Firewall helps in protecting the computer and the personal information in it and blocks unauthorised sites to steal personal information from the computer.

Since 25 years Firewalls have been a good newtork security devices.

Hope this information was helpful to you.

All The Best!!