A Record - address record, contains a domain to IP address mapping
CNAME - Canonical name record, alias of one name to another canonical domain name. useful for creating multiple subdomains like docs.mysite.com, home.mysite.com, news.mysite.com for different purpose
MX Record - Mail exchange record, direct email to servers (hosts providing MTA services) for a domain
NS Record - Name server record, determines which servers will communicate DNS information for a domain (delegates a DNS zone to use the given authoritative name servers)
TXT Record - contains arbitrary text but can also be used to define machine readable text.
For details and complete record type list, look at wikipedia List_of_DNS_record_types
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