What are firewalls?
A firewall is a network security device that is either a hardware or software which monitors all the incoming and outgoing traffic. Based on a defined set of security rules it accepts, rejects or drops the specific traffic. The modes are as follows :
Firewall, in other words, serves as the boundary between the internal secured networks and outside untrusted network such as the Internet.
Firewalls are of two types :
Categorization of firewall based on generation :
In Windows, already a firewall is installed that is Windows Firewall.