Surveillance (/sərˈveɪ.əns/ or /sərˈveɪləns/) is a practice defined by the monitoring of behavior, activities, or other changing information for the purpose of influencing, directing or protecting people. This can include observation from a distance by means of electronic equipment (such as cameras) or interception of data and electronically transmitted information. It can also include simple or relatively low-technology methods such as human intelligence.

detect clasify identify track understand preemt