CNAME records point back to an A record. So if you change the IP address of the A record, all your CNAME records pointed to that record automatically follow the new IP of the A record. The alternative solution is to have multiple A records, but then you would have multiple places to change the IP address which increases the chances of error. Using CNAMEs makes your DNS data easier to manage. The most common CNAMEs are subdomains "www" and "ftp".
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