DNS is an administrative space which allows more control of DNS components. DNS Zone is portion of DNS namespace that manage by an organisation or administrator. DNS servers as an administrative space with control of DNS component and record nameserver.DNS zone can contain multiple subdomains and multiple zones can exists on the same server. DNS server maintain a database of information that contains zzones explanation.
DNS zone file is plain text file stored on a controlling DNS server that contains all records for every domain within that zone given.Zone file contains many different record types but always began with SOA records.