CNAME record

CNAME (Canonical NAME) records let one hostname point at another instead of directly at an IP. Useful when:

• Pointing www.yourdomain.com at a cloud host's hostname like yourdomain.netlify.app.
• Verifying email domain ownership at services like SendGrid, Mailchimp.
• Pointing a custom subdomain at a SaaS provider (e.g., app.yourdomain.com → vendor.com).

Two important limitations:

• You cannot have a CNAME on the zone apex (i.e., on yourdomain.com itself, only on subdomains). The workaround is "ALIAS" or "ANAME" records, which most providers including Modusdom support but which aren't standard DNS.
• A CNAME and any other record type on the same name conflict. If www is a CNAME, you can't also have www A or TXT records at the same name.