An A-record is an entry in your DNS zone file that maps each domain name (e.g. yourdomain.com) or subdomain (e.g. subdomain.yourdomain.com) to an IP address. In other words, the A-record specifies the IP address to which the user would be sent for each domain or subdomain. This means that you can have different subdomains of your website resolving to different IP addresses, which could be useful if they are hosted on different servers.
Example A-record for yourdomain.com:
Host Name: www - IP Address: 217.22.89.217
This would cause www.yourdomain.com to resolve to the IP address 217.22.89.217.
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