Explanation
https://help.okta.com/en/prod/Content/Topics/Mobile/okta-verify-admins.htm#:~:text=Okta%20Verify%20is%2 Okta Verify is an MFA factor and authenticator app developed by Okta. The app is used to confirm a user's identity when they sign in to their Okta account.
After an end user installs the app on their primary device, they can verify their identity by approving a push notification or by entering a one-time code. When a user signs in to their organization, the Okta Verify app prompts them to verify their identity.

Explanation
https://developer.okta.com/docs/guides/create-an-api-token/token-expiration-deactivation/

Explanation
Once the user is redirected to Okta they'll need to enter their Okta credentials, unless they had already authenticated into Okta in a previous session within the same browser. In either case, a successful authentication request will redirect the user back to the SP's Assertion Consumer Service (ACS) URL with an embedded SAML response from Okta. At a minimum, the response will:
* Indicate that it is indeed from Okta and hasn't been altered, and contain a digital signature proving such. This signature will be verified by the SP using a public key from Okta that was previously uploaded to the SP as a certificate.
* Indicate that the user has authenticated successfully into Okta
* Indicate who the user is via the NameID, a standard attribute used in SAML assertions.
https://support.okta.com/help/s/article/Beginner-s-Guide-to-SAML?language=en_US