For questions about Android apps in general. (Do not use if your question is for a specific application. Note that App Development is off-topic here.)
The "applications" tag is for questions regarding apps that can be installed on an Android device. Because there are a number of unique issues regarding apps that you pay for, if your question relates to one of these issues you should consider adding the more specific paid-apps tag as well.
Do not use this tag if there is an application-specific tag for the application you are asking about.