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A scanner is a technological device which acquires information from the world and converts it into data, often to be analyzed or stored by a computer.
In the context of computing, a scanner is a device which analyzes a physical image (such as a photograph, printed text, or handwriting) and converts it to a digital image. See scanner (computing).
There is also another type of scanner that is used generally for receiving radio broadcasts above 30Mhz. They are illegal in some states and countries.
In computer networking, a scanner is a computer program to probe a remote system, typically to discover a vulnerability.
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