Attempts at unauthorized intrusion occur quite often, even after the adoption of the necessary security policies and practices for the information network. These are attacks in which an attacker gains access to the system using various hacking techniques. A firewall is a hardware and software-based network security system that uses certain rules to manage incoming and outgoing network packets. The firewall controls access to network resources through a positive management model. There are various traditional firewalls, such as packet filters, program-level gateways, and chip-level gateways, which have their pros and cons. To overcome the shortcomings of the traditional firewall, a new generation of firewalls is introduced. The article presents the study of traditional firewalls and their evolution to a new generation firewall and its benefits. New firewalls still belong to the third generation, but are often referred to as the "next generation" or NGFW. This type combines all previously used approaches with an in-depth review of filtered content and its comparison with a database to identify potentially dangerous traffic. Modern firewalls often have built-in additional security systems: virtual private networks (VPNs), intrusion prevention and detection systems (IPS / IDS), authentication management, application management, and web filtering. Their state-of-the-art technology can filter outbound traffic. This helps reduce the likelihood of data theft by attackers. In addition, an important function of the firewall is to reduce the risk of devices becoming part of a botnet (a malicious network with a large group of devices controlled by cybercriminals).