What is a firewall? In network security, firewall is considered a first line of defense in protecting private information. "A firewall sits at the junction point, or gateway, between the two networks, which are often a private network and a public network such as the Internet." (John V. Harrison, Hal Berghel, 2004, A Protocol Layer Survey of Network Security). It is a system designed to prevent certain access to or from another network. It has two …showed first 75 words of 1647 total…

…showed last 75 words of 1647 total…that protects your computer from the danger world of the internet. It comes with different types and each have its advantages and disadvantages, and the choice to use which type is highly depends on the user. Not to say it can make us completely safe from all kinds of attack in the internet, however, it already can protect us from most of them and protect our sensitive data or secret information not to leak out.