1. What is the difference between building an 'Application' and a 'Solution' in Zoho Creator Developer Zone?

2. I want to build an app and have customers subscribe to my app rather than sell the app to them. What is best for me?

3. Is there a way for a client to subscribe to my software and for them to add their own users like you would using any other software out there?

I really like the Zoho Creator platform but I have no idea how to get my app to market in an effective way..