EPP Code (Auth Code)
An EPP (Extensible Provisioning Protocol) code, also called an authorization code or auth code, is a unique password assigned to a domain name that is required to authorize a [[domain-transfer|domain transfer]] between registrars.
Example
Your EPP code might look like 'x7!kP9mQ2rW' — you get it from your current registrar and provide it to the new one.
Referenced in Guides
Domain Basics