Two-step verification (2SV) is a login feature available on many online accounts today. It provides an additional step (but not an added factor) in the authentication process by prompting a user to enter a code sent to their computer or pre-verified device. 2SV has the ability to protect a users account in the event that their corresponding password has been compromised. Provided below is a guide on how you can enable this feature on your Google account. It is recommended that you set up at least one of these settings at least two of these two-step settings.”]
Source: https://grahamcluley.com/better-protect-google-account-step-verification-2sv/