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Domain Name System (DNS) is a hierarchical naming system for computers, services, and other resources connected to the Internet. It provides a means of translating human-readable names like www.google.

com into numerical addresses that can be used to locate the corresponding computers on the network. DNS is managed by the Internet Corporation for Assigned Names and Numbers (ICANN), a private non-profit corporation.

A DNS zone is a specific part of the DNS hierarchy. It is a set of related DNS servers that can provide information about the names, addresses, and other information for a specific domain or set of domains. For example, the zone for google.com would include the DNS servers for google.

com, www.com, and youtube.com.

A domain is a logical grouping of subdomains. For example, the domain for google.com would include the subdomains google.com, youtube.

com, and blogspot. A domain can also include other types of resources, such as images, scripts, and stylesheets.