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Voice search, also called voice-enabled search, allows the user to use a voice command to search the Internet, or a portable device. Currently, voice search is commonly used in (in a narrow sense) “directory assistance”, or local search. Examples include Google 411, Tellme directory assistance and Yellowpages. com’s 1-800-YellowPages. In a broader definition, voice search include open-domain keyword query on any information on the Internet, for example in Google Voice Search.