> ## Documentation Index
> Fetch the complete documentation index at: https://docs.verisoul.ai/llms.txt
> Use this file to discover all available pages before exploring further.

# Glossary

> Key terms and definitions for Face Match verification

## 1:N Identification

Authentication whereby an identity is captured and compared with all previously captured identities. The search results are used to establish the identity of a person. In short, a 1:N Identification answers the question:

**Who is this person and are they unique?**

**Examples of a 1:N Identification include:**

* Any place that requires Social Security Number (SSN)
* ID/Passport issuance
* Verisoul's Liveness & Uniqueness solution

## 1:1 Verification

Authentication whereby an identity is captured and compared with a single previously captured identity. In short, a 1:1 Verification answers the question:

**Is this person who they claim to be?**

**Examples of a 1:1 Verification include:**

* Apple's FaceID
* CLEAR travel biometrics
* Inputting a PIN at a bank ATM

This approach is usually made more secure by adding an additional "factor" of authentication like having possession of a phone, password, etc.