Which type of DNS record is used to map one domain to another, pointing only to domain names or subdomains?

The Canonical Name Record (CNAME) is designed specifically for the purpose of mapping one domain name to another. This type of DNS record allows you to create an alias for your domain, enabling users to access a service via multiple domain names or subdomains that point to the same IP address of the original domain. For example, if you have a web application at www.example.com, you might use a CNAME record to also allow access via app.example.com, directing both to the same resources.

CNAME records are particularly useful for managing URLs or providing flexibility in domain usage without the need to create multiple A records. They simplify domain management since any IP address changes can be handled by modifying a single A record rather than updating multiple records scattered across different domain names.

The other types of DNS records serve different specific functions. For instance, Text Records (TXT) are used to store arbitrary text data in DNS, often for verification purposes or to provide additional information about the domain. Mail Exchange Records (MX) are utilized to direct email to the appropriate mail servers for a domain, and Address Records (A records) directly map a domain name to its corresponding IP address, which is essential for locating the server hosting the domain. Hence, the CNAME record