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This involves the user speaking into a microphone.

Plastic or Paper used to store data in various ways.

Uses radio waves to transmit a unique serial number.

Used mostly for multiple choice exams.

Paper based documents are scanned and each part of the image is compared to a dictionary of known letters and shapes.

This device reads patterns of black and white lines.

This is used almost exclusively by banks to process cheques.

This is used to detect speech from a user.

A device used to capture video for conferencing.

These usually record videos.