Firewall

Firewall, important thing that you have to know 
if you want safe even surfing in the Internet.

A firewall is a system or group of systems running the access control security between a secure internal network and an untrusted network such as internet.Firewall designed to permit the trusted data or data via a trusted, easy to refuse service attack, preventing internal network from outside attacks that couldpenetrate the firewall every time.

Generally also used to control access to anyone who has access to a private network from outside parties. Today, the term firewall became prevalent that the term refers to systems that manage communication between two different networks.Given today many companies that have access to the Internet and also of course the network incorporated in it, then the protection of digital capital of the company from attacks by hackers (hackers, pemata-eye, or other data thieves) becomes mandatory.