WHAT'S FIREWALL,

LETS GET TO KNOW ABOUT FIREWALL;

A firewall is a network security system that monitors and controls incoming and out going network traffic based on pre determinedsecurity rules. A firewall typically establishes a barrier between a trusted network and an untrusted network ,such as internet.

A fire wall is a saftey barrier between a device-in the case,

your android -and the internet.

It acts to filter communication that attempts to cross it,acts as a gatekeeper to allow only those only those who are authorized.

☝This is structural way to under stand the process of firewall.

-This is all the main of  FIRE WALL

source;@e_rror040(insta)

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i hope u found this useful.This was the straight forward way to give u the best visualization about the concept 

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THANKYOU!

                    -yash