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A computer is an electronic device that manipulates information, or data. It has the ability to store, retrieve, and process data. -
It work by transmitting electrical signals over a wire laid between stations. -
a telephone is a device that converts analog audio into electrical signals that can be transferred to other telephone users. The telephone enables people to communicate with others all over the world. -
In radio communication, used in radio and television broadcasting, cell phones, two-way radios, wireless networking and satellite communication among numerous other uses, radio waves are used to carry information across space from a transmitter to a receiver, by modulating the radio signal. -
Televisions receive broadcasting signals and change them into pictures and sound. -
Tablets can be used to browse the Internet, check email, download and read books, play games, watch videos, organize content, and much more. Most tablets are touch operated and are between the size of a smartphone and a laptop. -
Mobile phones are used for a variety of purposes, such as keeping in touch with family members, for conducting business, and in order to have access to a telephone in the event of an emergency.