"Hey, wanna develop an app?"

An interesting way to misspell "subscription"

I mean, those words are still used by people in technical fields. It's the laypeople who use "app" for everything, and even if "app" didn't exist, they would still pick one generic word like "software" or "program" for everything since they don't know the difference between any of the words on the left side.

What is the difference between an application and a program?