A firewall is a group of connected programs, located at a network gateway server that protects the resources of a private network from users and from other networks. Mostly, a firewall working intimately with a router program, look at each network packet to decide whether to forward it regarding its destination. A firewall also enters or works with an alternative server that makes network requirements on behalf of workstation users.
Firewalls are regularly used to avoid unauthorized internet users from approaching private networks connected to the Internet. A firewall is considered a first line of security in protecting private information. A firewall is a blockade between the public internet and our private computer system.
Firewalls can protect both individual computers and corporate networks from harsh intrusion from the Internet, but to use correctly it must be understand clearly. A firewall be placed at the connection point or gateway between the two networks, usually a private network and a public network like the Internet.