Electronic surveillance refers in practice to the monitoring, interception or recording of communications or activities using electronic or digital means, such as telephone tapping, email or messaging interception, CCTV, covert audio or video devices, GPS tracking and monitoring of internet use or metadata. Across the UK and Ireland it is regulated by detailed statutory regimes rather than by a single overarching definition. In England and Wales, Scotland and Northern Ireland, key legislation includes the Regulation of Investigatory Powers Act 2000 (RIPA), the Investigatory Powers Act 2016 and related codes of practice, which govern interception of communications, acquisition of communications data, equipment interference and directed and intrusive surveillance. In Ireland, the Interception of Postal Packets and Telecommunications Messages (Regulation) Act 1993 and the Communications (Retention of Data) Acts are central. Electronic surveillance typically arises in criminal investigation, national security, regulatory enforcement, employment monitoring and data protection. It engages fundamental rights to privacy, data protection and fair trial, and is tightly controlled through warrant and authorisation procedures, necessity and proportionality tests, oversight by commissioners or supervisory bodies, and exclusionary or remedial rules where unlawfully obtained evidence is used.