There are four main types of surveillance:
Biometrics systems are designed to identify or verify the identity of people. It identifies individuals with distinctive physiological or behavioral characteristics.
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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.
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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.
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Audio Surveillance
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.
