Computer firewall, other may also said as computer network firewall is a software that run as background process that will filter any unwanted incoming or outgoing traffic sent to and from your computer. Computer network already used by human couple decade ago; and the most familiar network protocol is TCP/IP. This TCP/IP protocol works using ports. These ports are like doors in your house, when you open the doors, any good or bad wind can enter your house. The same analogy like TCP/IP ports, when you open or close some ports, you can receive bad or good incoming traffics. TCP/IP networks divide any communications between computers into data packets; these data packets received and assemble by your computer.
If you receive bad incoming traffic, your computer will be in danger because these data packets can be changed into dangerous virus, spyware, adware or any malware that can ruin your computer.
Many modern firewall systems especially firewall for desktop might also have process and application monitoring. When the firewall found any suspicious application, it may alert you to decide further actions, or might be just terminate it according to the previous behavior.
When you decide to combat with virus, spyware, adware and many malware; you will always need good coded firewall. This firewall can work hand in hand with installed anti virus, anti spyware and anti adware that will increase your computer security in maximum level.
