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Skype is a proprietary telecommunications application that specializes in providing video chat and voice calls between computers, tablets, mobile devices, the Xbox One console, and smartwatches over the Internet. Skype also provides instant messaging services. Users may transmit text, video, audio and images. Skype allows video conference calls.
Wireless telegraphy or radiotelegraphy is the transmission of text messages by radio waves, analogous to electrical telegraphy using cables. [ 1 ] [ 2 ] Before about 1910, the term wireless telegraphy was also used for other experimental technologies for transmitting telegraph signals without wires.
Examples of such messaging services include: Skype, Facebook Messenger, Google Hangouts (subsequently Google Chat), Telegram, ICQ, Element, Slack, Discord, etc. Users have more options as usernames or email addresses can be used as user identifiers, besides phone numbers. Unlike the phone-based model, user accounts on a multi-device model are ...
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Signal is an open-source, encrypted messaging service for instant messaging, voice calls, and video calls. [14] [15] The instant messaging function includes sending text, voice notes, images, videos, and other files. [16] Communication may be one-to-one between users or may involve group messaging.
A telegraph message sent by an electrical telegraph operator or telegrapher using Morse code (or a printing telegraph operator using plain text) was known as a telegram. A cablegram was a message sent by a submarine telegraph cable, [ 4 ] often shortened to "cable" or "wire".
The Signal Protocol (formerly known as the TextSecure Protocol) is a non-federated cryptographic protocol that provides end-to-end encryption for voice and instant messaging conversations. [2]
In signal processing, a signal is a function that conveys information about a phenomenon. [1] Any quantity that can vary over space or time can be used as a signal to share messages between observers. [2] The IEEE Transactions on Signal Processing includes audio, video, speech, image, sonar, and radar as examples of signals. [3]