Difference between zone and domain
Domain name servers store information about part of the domain name space called a zone. The name server is authoritative for a particular zone. A single name server can be authoritative for many zones.
Understanding the difference between a zone and a domain is sometimes confusing. A zone is simply a portion of a domain. If there are no subdomains, then the zone and domain are essentially the same. In this case the zone contains all data for the domain
For example, the Domain google.com may contain all of the data for google.com, maps.google.com and testing.google.com(Like SOA, MX, TXT...).
However, the zone google.com contains only information for google.com and references to the authoritative name servers for the subdomains. The zone google.com can contain the data for subdomains of google.com if they have not been delegated to another server. For example, maps.google.com may manage its own delegated zone. testing.google.com may be managed by the parent, google.com.
For example, the Domain google.com may contain all of the data for google.com, maps.google.com and testing.google.com(Like SOA, MX, TXT...).
However, the zone google.com contains only information for google.com and references to the authoritative name servers for the subdomains. The zone google.com can contain the data for subdomains of google.com if they have not been delegated to another server. For example, maps.google.com may manage its own delegated zone. testing.google.com may be managed by the parent, google.com.
Domain name server & domain name system
DNS(domain name server) is the backend system that resolves domain names and IPs worldwide. DNS (domain name system) is the whole system in whcih the process of resolving is done. You can say DNS as Domain name system or server.
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