Which software prevents external access to a system?

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By implementing a firewall, organizations can effectively minimize the risk of cyber threats, such as hackers and malware, from infiltrating their systems. It acts as a gatekeeper, allowing only authorized traffic to pass through.

Additionally, a firewall helps to establish a clear boundary between the internal network and the external, untrusted internet. This segregation ensures that sensitive or private data remains protected within the confines of the private network.

The functionality of a firewall extends beyond mere access control. It also includes features like logging and monitoring, which enable administrators to track network activities and identify potential security breaches.

The accurate solution to the posed question is Firewall. This technology serves as a barrier between a system and external entities, safeguarding against unauthorized access.