Two popular examples of pocket assistants (voice assistants) are Google Assistant (Hey Google) and Siri (Hey Siri).
Source: Chapter 6, Section 6.2 – Applications of Natural Language Processing
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The source passage lists voice assistants such as Google, Alexa, and Siri as examples. "Pocket assistants" refers to voice/virtual assistants on personal devices. Acceptable answers include any two from: Google Assistant, Siri, or Alexa. Examiners expect recognisable names — just naming two correctly earns the mark.