Alexa is designed to get smarter every day. Training Alexa with recordings from a diverse range of customers helps ensure Alexa works well for everyone. An extremely small fraction of voice recordings are manually reviewed to improve Amazon services and develop new features. If you would like to control how you help improve Alexa, visit Alexa Privacy Settings
or the Alexa app (Settings > Alexa Privacy > Manage How Your Data Improves Alexa). If you turn this setting off, voice recognition and new features may not work well for you.