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Army Knowledge Online (AKO) provides web-based enterprise information services to the United States Army, joint, and Department of Defense customers. Enterprise services are provided to these customers on both classified and unclassified networks, and include portal, e-mail, directory, discovery, and single sign-on functionality. 
In computer technology and telecommunications, online indicates a state of connectivity and offline indicates a disconnected state. In modern terminology, this usually refers to an Internet connection, but (especially when expressed "on line" or "on the line") could refer to any piece of equipment or functional unit that is connected to a larger system.