Don't feel bad if you're confused about the difference between mobile apps and mobile sites - some developers are even confused (must be confused - they couldn't be dishonest, could they?)

Before you talk to developers about creating an app for you, make sure that you're on the same page & that they're not referring to a mobile site.  Glerin Business Resources has a short article explaining the difference between mobile apps and mobile sites, and explaining why apps are usually more expensive than mobile sites.  Take a quick read to help you make sure you get what you pay.