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A firewall serves as a security system designed to monitor and control incoming and outgoing network traffic based on predetermined security rules. Its primary function is to protect a network from unauthorized access, whether from external threats, such as hackers, or internally from malicious activities. By acting as a barrier between a trusted internal network and untrusted external networks, firewalls help to prevent unauthorized users and potential attacks while allowing safe traffic, such as requests from legitimate users.

In this context, increasing bandwidth, enhancing graphics performance, and storing data safely are unrelated functionalities. Bandwidth relates to the maximum data transfer rate of a network, graphics performance pertains to the capabilities of a computer's graphical hardware or software, and data storage safety involves data management and protection methods. These features do not align with the fundamental role of a firewall in network security.