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| a sign that represents information, such as a command, a direction, or a warning |
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| a set of rules used to interpret signals that convey information |
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| a communication method that uses electromagnetic means |
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| a signal corresponding to a quantity whose values can change continuously |
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| a signal that can be represented as a sequence of discrete values |
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| a hair-thin, transparent strand of glass or plastic that transmits signals using pulses of light |
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a transmission of a signal using wires, cables, or optical fibers |
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a transmission of a signal using electromagnetic waves |
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to change a wave’s amplitude or frequency in order to send a signal |
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| a continuous wave that can be modulated to send a signal |
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| a tube that uses an electron beam to create a display on a phosphorescent screen |
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| the smallest element of a display image |
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| an electronic device that can accept data and instructions, follow the instructions, and output the results |
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| a storage device that allows stored data to be read in the same access time |
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| a memory device containing data that cannot be changed |
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| the equipment that makes up a computer system |
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the instructions, data, and programming that make a computer system work |
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| the software that controls a computer’s activities |
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| a large computer network that connects many local and smaller networks |
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