Videotelephony
Videos
Videotelephony, also known as video chat, videoconferencing, video calling, or telepresence, is the use of audio and video for simultaneous two-way communication.
A telepresence system in 2007
Videotelephony predicted to be in use by 2000, as envisioned in 1910 (artist's conception)
Videotelephone booth, 1930
Gregorio Y. Zara was a Filipino engineer and physicist best remembered for inventing the first two-way video telephone.
Closed-circuit television
Videos
Closed-circuit television, also known as video surveillance, is the use of closed-circuit television cameras to transmit a signal to a specific place on a limited set of monitors. It differs from broa
Videotelephony
…Simple analog videophone communication could be established as early as the invention of the television. Such an antecedent usually consisted of two closed-circuit television systems connected via coax cable or radio. An example of that was the German Reich Postzentralamt (post office) videotelephone network serving Berlin…
Surveillance cameras on the corner of a building
Desk in one of the regional control-rooms of the National Police in the Netherlands in 2017
CCTV control-room monitor wall for 176 open-street cameras in 2017
Sign warning that premises are watched by CCTV cameras