OK Google is your google voice assistant. Whenever you say "Ok, Google" that means that you are ready to put in a voice command, so it launches. You can ask everything you can check on your phone, on the phone or on the web through your speech.
@dimablover Api.ai allows developers to integrate artificial intelligence into their app. OK Google is a curation of command you can ask Google Now (one of the most popular virtual assistants which answers queries through artificial intelligence).
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