“We need to build a mobile app!”
“Sure, boss. What exactly should this mobile app do?”
“Doesn’t matter! All our competitors have mobile apps, so we need one too!”
This is exactly the wrong way to launch a mobile app project.
Yes, you probably do need a mobile app because an increasing number of people do a majority of their computer activities on mobile devices. And yes, most or all your competitors have mobile apps available on app stores. These are necessary but not sufficient conditions for building a mobile app.