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The definition of FQDN is Fully Qualified Domain Name. This term refers to the complete domain name for a specific computer, or host, on the internet or private network. An FQDN includes both the hostname and the domain name, providing a unique and complete path to access a resource. For example, in the FQDN "www.example.com", "www" is the hostname and "example.com" is the domain name, indicating the exact location within the Domain Name System (DNS).

This precise naming convention is crucial for network architecture, as it ensures that each device can be uniquely identified without ambiguity, allowing systems to communicate correctly over the internet or an internal network. The FQDN plays a fundamental role in DNS lookups, helping translate user-friendly domain names into IP addresses that computers use to communicate with each other. Understanding FQDNs is crucial for anyone involved in network administration or security, as they are foundational for proper domain management, routing, and cybersecurity practices.