-
A computer is a machine that can be programmed to carry out sequences of arithmetic or logical operations automatically. -
A electrical telegraph was a point-to-point text messaging system. At the sending station switches connected source of current to the telegraph wires. -
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. -
A telephone is a telecommunications device that permits two or moreusers to cunduct a conversation when they are too far apart to be heard directly. -
A television is a telecommunication medium used for transmitting moving images in monochrome, or in color, in two or three dimensions 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. -
Is a portable telephone that can make and receive calls over a radio frequency link while the user is moving within a telephone service area.