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radio
Radio is sound communication by radio waves, usually through the transmission of music, news, and other types of programs from single broadcast stations to multitudes of individual listeners equipped with radio receivers. -
telegraph
A telegraph is a device for transmitting and receiving messages over long distances, i.e., for telegraphy. The word telegraph alone now generally refers to an electrical telegraph. Wireless telegraphy is transmission of messages over radio with telegraphic codes. -
televesion
One of the first mechanical televisions used a rotating disk with holes arranged in a spiral pattern. This device was created independently by two inventors: Scottish inventor John Logie Baird and American inventor Charles Francis Jenkins. Both devices were invented in the early 1920s. -
typewriter
A typewriter is a mechanical device to produce printed characters on a piece of paper by typing individual keys. Introduced in the 1870s, they become widely used for business communications up until the rise of modern day personal computers in the 1980s. -
computer
It has the ability to store, retrieve, and process data. You may already know that you can use a computer to type documents, send email, play games, and browse the Web. -
youtube
YouTube is a video sharing service where users can watch, like, share, comment and upload their own videos. The video service can be accessed on PCs, laptops, tablets and via mobile phones. -
facebook
Facebook is a website which allows users, who sign-up for free profiles, to connect with friends, work colleagues or people they don't know, online.