Overview
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Design
Architecture vs Design
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Concepts
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Data Standards
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Clinical Serialization Standards
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Serialization Standards
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Stereographic Projection
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Science of Great User Experiences
Visual Design
Glossary

DNS record

DNS Records are instructions that live in authoritative DNS servers and provide information about a domain including what IP address is associated with that domain and how to handle requests for that domain.

There are a few different types of records, each of which have different meanings, among which:

A, returns a IPv4 address.
AAAA, returns an IPv6 address.
CNAME, points to another domain name (which results in a new DNS request for the name that is returned).
MX, for Email.
NS, to point to other DNS Servers

Sources

https://en.wikipedia.org/wiki/List_of_DNS_record_types