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Simply,,,
"A Record" used to point DNS name "example: www.xyz.com" to IP address mainly of hosting server "example:52.125.26.35"
PTR Record, is the reverse of "A Record" it points IP address to DNS name.
(A) A-Host Record : host name to IP (Internet protocol)
( PTR ) Pointer records are used to map a IP(Internet protocol) to a host name