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Computer, Charles Babbage
A computer is a programmable device that stores, retrieves, and processes data. -
Telegraph, Joseph Henry
Telegraph devices send messages over long distances. -
Telephone, Alexander Graham Bell
The telephone is the electrical system of communication that you use to talk directly to someone else in a different place. -
Radio, Guillermo Marconi
Radio is a sound communication by radio waves, usually through the transmission of music, news, and other types of programs. -
Television, John Logie Baird
Television is an electronic device used to receive sound and images which create television programs that people watch. -
Tablet, Alan Kay
A tablet is a wireless, portable personal computer with a touchscreen interface. -
Mobile phone, Martin Cooper
A mobile phone is a wireless handheld device that allows users to make and receive calls.