In the future, computers and AI will be everywhere, doing whatever they can to get our attention.
This app is hands-free and you don't really "use" it. Once it gets going, you just have your conversation as usual and let it listen. Rather than you driving the app, the app is monitoring your activity looking for an opportunity to help. It listens while you talk and uses the things you mention to query for images on the internet, eagerly showing you things that might be interesting, given that you seem to be talking about them.
It uses the Web Speech API that has been available in Google Chrome for over 10 years.