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A firewall is a boundary or a wall to keep intruders from attacking the network. The firewall is a network device that is in between a private network and the internet. The firewall is configured to inspect network traffic that passes between the network and the internet. We can assign rules or protocols to the firewall to allow data to be shared. If the protocol isn't included in the approved list, it would destroy or discard the packet of data and deny it from entering the network.
A firewall monitors all of the traffic entering your computer network. A two-way firewall does double duty and monitors the traffic exiting your network as well. Information is sent over networks in packets. Those packets are what the firewall investigates to determine if there's something they contain that's potentially hazardous to your network's security. Even you as the sender could transmit something bad without knowing it, which is why it's crucial to have the firewall police the contents.
A firewall helps block Trojan horses. These types of intruders latch onto your computer files, and then when you send out a file, they go along for the ride to do more damage at the destination. A firewall blocks them
from the outset, before they have a chance to infect your computer.
Having a firewall keeps hackers out of your network. Without a firewall security, a hacker could get a hold of your computer and make it a part of what’s called a botnet, which is a large group of computers used to conduct illicit activity, such as spreading viruses.
Having firewall security will reduce the risk of keyloggers monitoring you. A keylogger is spyware software that cybercriminals try to put on your computer so they can target your keystrokes. After they can identify what you're typing in and where they can use that information to do the same thing, this knowledge can help them login to your private online accounts.