A voice assistant is a digital assistant that uses voice recognition, speech synthesis, and natural language processing (NLP) to provide a service through a particular application.
Learn More About Voice Assistants https://www.smartsheet.com/voice-assistants-artificial-intelligence
What a Virtual Assistant is and How it Works https://www.lifewire.com/virtual-assistants-4138533
There are some of the most popular virtual assistants in the United States. There are others out there. See more here: https://en.wikipedia.org/wiki/Virtual_assistant