Question

what is firewall? what is its function​

Answer 1

Answer:

firewall not farewell

Explanation:

A farewell is also an expression of good wishes at a parting. If you're leaving a job after being there a long time, your co-workers might throw you a farewell party. Farewell is an expression, like "goodbye," but also a noun — if you like to leave without a lot of fuss, you don't like long farewells.

Answer 2

Explanation:

A firewall is a network security device that monitors incoming and outgoing network traffic and decides whether to allow or block specific traffic based on a defined set of security rules. Firewalls have been a first line of defense in network security for over 25 years.