Biometrics systems are designed to identify or verify the identity of people. It identifies individuals with distinctive physiological or behavioral characteristics.
Phone surveillance is the act of performing surveillance on phone conversations, location tracking, and data monitoring of a phone. It gathers data communicated across mobile, fixed, or next-generation networks.
Internet surveillance is the monitoring of online behavior, activities, or other changing information, usually of people and often in a surreptitious manner. Technologies are able to gather information communicated across the internet.
Audio surveillance is the act of listening to third-party conversations and recording them. This technique is frequently used by technologies that are able to record and transmit audio.