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It is important to understand the different types of mobile applications. I will put them in two categories, according to what they do.
Standalone mobile applications are applications such as alarms, phone dialers, and offline games. Web service-backed mobile applications are applications like e-mails, calendars, Twitter clients, online games, and applications that interact with web services.
This distinction between mobile applications is unique to the context of this book. Although PhoneGap can be used to implement standalone mobile applications, the nature of PhoneGap-based mobile applications typically falls into the category of “service-backed mobile applications.”