What is firewall in computer?
A firewall is a network security system designed to prevent unauthorized access to or from a private network. It monitors and controls the incoming and outgoing network traffic based on predetermined security rules.
Firewalls have been a first line of defense in network security for over 25 years. They establish a barrier between secured and controlled internal networks that can be trusted and untrusted outside networks, such as the Internet. Firewalls are generally designed to protect network traffic and connections, and therefore do not attempt to authenticate individual users when determining who can access a particular computer or network. This means that the only traffic allowed onto the network is defined in the firewall policy, all other traffic is denied.
In addition to limiting access to your computer and network, a firewall is also useful for allowing remote access to a private network through secure authentication certificates and logins. Firewalls can be implemented in both hardware and software, or a combination of both.
Hardware firewalls can be purchased as a stand-alone product but are also typically found in broadband routers, and should be considered an important part of your system and network set-up.
Where, Software firewalls are installed on your computer and you can customize it, allowing you some control over its function and protection features. A software firewall will protect your computer from outside attempts to control or gain access your computer.