Meaning of root zone

In a db.root file, what are these lines supposed to mean?

$TTL 86400
. IN SOA A.ROOT-SERVERS.EDU. root.A.ROOT-SERVERS.EDU. (
        1       ; serial number (update count)
        28800   ; refresh (8 h)
        7200    ; retry (2 h)
        604800  ; expire
        10800   ; negative caching
        )

Answer

Recursive bind configurations have a zone file for ‘.’ often named db.root
The root zone consists of the top level domains such as com, net, org, arpa, us, ca, etc

TO learn more please refer https://en.wikipedia.org/wiki/Root_name_server

Attribution
Source : Link , Question Author : Tommy Bobby , Answer Author : Techiescorner

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