Answer:
application software
Explanation:
"Application software" is a common phrase nowadays that is being abbreviated as "app." Casey described the new app as "amazing," which means that the app could be a game, a browser, a photo editor or other programs that are deemed important and mostly exciting for the end users–people who are targeted by the software. In the situation above, they could be talking about a trendy app. New apps are being created by people over the course of years.
