Ever since 2011, virtual voice assistants have been all the rage. First, Apple's (NASDAQ:AAPL) Siri came out to much fanfare, followed by Google (NASDAQ:GOOGL) Now. Nuance Communications (NASDAQ:NUAN), which powers the voice recognition behind Siri, even has its own Nina assistant. Amazon.com (NASDAQ:AMZN) has now reportedly purchased Evi, a mobile assistant app for iOS and Android. The e-tailer has also separately acquired several small voice recognition companies over the years.

In the video below, Fool contributor Evan Niu, CFA, discusses how Amazon could be looking to integrate a new voice assistant into future Kindle Fires or possible a Kindle Phone.

Fool contributor Evan Niu, CFA, owns shares of Apple. The Motley Fool recommends Amazon.com, Apple, Google, and Nuance Communications. The Motley Fool owns shares of Amazon.com, Apple, Google, and Nuance Communications. Try any of our Foolish newsletter services free for 30 days. We Fools may not all hold the same opinions, but we all believe that considering a diverse range of insights makes us better investors. The Motley Fool has a disclosure policy.