The above diagram depicts a typical data-flow that occurs after a user utters a question to the moment they get an answer. Text or messenger-based chatbots work similarly but lack the speech recognition and synthesis steps. A key differentiation among virtual assistants conveyed in the diagram is the differentiation between question and answer assistants, whether general questions or specific to a domain, and action assistants, those that will book an appointment in your calendar or book a hotel room for you, hence the name of personal digital assistants.
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