The Oxford dictionary explains that firewall is a part of a computer system that prevents people from obtaining information without authorization, but still allows them to receive the information that is sent They. The word firewall was also used by Lightoler (1764) to describe walls that separated parts of a building, saving lives and property. In the late 1980s, network security firewalls were used to distinguish networks from others. Firewall can also be defined as a system or group of systems having two networks on an access control policy. Nowadays, Internet security has been an important consideration when someone builds an organization. This is because, using the firewall. It can protect and secure an organization's secret data and files. The firewall is very important because it can reduce the risks of confidential information to the maximum. It can also keep data and file. In the past, the organization didn't really know the firewall existed. They also don't care about the importance of the firewall. This is because there is not an influx of many users like nowadays. Hardware and software are combined to obtain the firewall. Access control policies, strengthening corporate security and others are the effective firewalls created in the markets. The firewall offers benefits to any organization that uses it and has it in their systems. The benefits they get are security and control. The firewall is chosen by the organization because it offers high security that can save all data and files. If the firewall is not used by the organization, it can expose the created system to intruders such as hackers and spies. The firewall demand is very high for... half of paper... that allows the traffic and one that exists to block it. Whether a company wants to place more emphasis on allowing or blocking traffic is up to the individuals who establish the security policies for that company. A company should not leave this to the discretion of the service or product that will provide the security because only the company knows what type of protection it needs. If a company is unsure of what type of security it needs, there are a number of vendors that can help create a secure network (see Chapter 4). Firewalls are designed to protect your network from attacks from another network. An effective firewall will allow authorized access only to the protected network and deny access to those who do not have it. Some firewalls only allow email traffic, thus protecting your network from any traffic