A verification flow is the sequence of checks a service uses to confirm that a person is the legitimate account holder before granting access or allowing sensitive changes. It may include email links, one-time codes, password re-entry, multi-factor authentication, or recovery questions. In modern platforms, the same flow can also gate profile changes, device registration, email updates, and account recovery.
This matters because verification is often the last control protecting an account after a password has been guessed, reused, or stolen. Attackers try to defeat verification flows by phishing codes, taking over mailboxes, intercepting session links, or abusing weak recovery processes. Defenders design stronger flows by using step-up authentication, short-lived codes, risk checks, device confirmation, and MFA on the recovery email itself. In services that tie profiles or permissions to an email address, the verification flow becomes part of the access model, not just a login convenience.