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What does an A record map?
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An A record maps a hostname to an IPv4 address. The AAAA record is its IPv6 counterpart.
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What does an AAAA record store?
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An AAAA record maps a hostname to an IPv6 address.
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What is a CNAME record?
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A CNAME (canonical name) makes one hostname an alias for another, e.g. www pointing to the apex domain.
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What does an MX record specify?
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An MX (mail exchange) record names the mail server responsible for receiving email for a domain, with a priority value.
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What does the TTL on a DNS record control?
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The TTL (time to live) tells resolvers how long to cache a record before re-querying. Lower TTLs speed up propagation of changes.