CNAME vs A

The A record points a name to a specific IP.

The CNAME record points a name to another name, instead of an IP.
blog.dnsimple.com. CNAME aetrion.github.io.
aetrion.github.io. CNAME github.map.fastly.net.
github.map.fastly.net A 185.31.17.133

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