What is an "A" record?

"Address" record. A DNS entry that maps each domain name (e.g. example.com) or subdomain (e.g. xyz.example.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 name. For example, you can have xyz.example.com point to one IP address, and pdq.example.com point to a different IP address.