The details differ between products, but most systems follow the same four steps.
1. Enrolment
Each employee registers once. The system captures a face image or fingerprint, converts it into a mathematical template and links it to their profile.
2. Capture at check-in
At check-in the person presents their face to a phone or terminal camera, or their finger to a scanner, and the system creates a new sample.
3. Matching
The new sample is compared with the stored template. If the similarity passes a set threshold, attendance is recorded for that employee.
4. Recording and reporting
The time-stamped event is stored and appears in attendance reports, break calculations and payroll inputs.