https://www.kaspersky.com/resource-center/definitions/what-is-facial-recognition

On Facebook, any photo tagged with a person’s name becomes a part of Facebook's database, which may also be used for facial recognition. ← the person’s faceprint is stored in Facebook’s database

Uses for facial recognition:

Unlokcing Phones

Law enforcement

Airports and boarder control

Finding missing persons

Reducing retail crime

Improving retail experience - Kiosk stores can recognise repeat customers, make product suggestions based on purchase history

• Face pay technology can also speed up check out process

Banking

Marketing and advertising - For example, frozen pizza brand DiGiorno used facial recognition for a 2017 marketing campaign where it analyzed the expressions of people at DiGiorno-themed parties to gauge people’s emotional reactions to pizza

Healthcare

Tracking student/ worker attendance (signing in and out of work. eg DEPUTY HEHE)

Recognise drivers - According to this consumer report, car companies are experimenting with facial recognition to replace car keys. The technology would replace the key to access and start the car and remember drivers’ preferences for seat and mirror positions and radio station presets.

https://www.oaic.gov.au/privacy/privacy-guidance-for-organisations-and-government-agencies/organisations/facial-recognition-technology-a-guide-to-assessing-the-privacy-risks

• facial verification refers to ‘one-to-one’ matching. It involves determining whether a face matches a single biometric template.
• facial identification refers to ‘one-to-many’ matching. It involves determining whether a face matches any biometric template in a database.