A firewall is a network security device used in web development to monitor and control the traffic between a private network, such as a corporate network or a web server, and the Internet, and to prevent unauthorized access, intrusion, or attacks. Firewalls can use various techniques, such as packet filtering, stateful inspection, or application-level gateways, to enforce security policies, and can provide various features, such as logging, reporting, or VPN support, that can enhance the visibility, compliance, and manageability of web systems. Firewalls can also help protect sensitive data, applications, and resources, and can minimize the risk of downtime, data loss, or reputational damage.
