Originally, application manifest is an xml file for application configuration, we can edit this xml file through appxmanifest which is a general application configuration panel. We can access appxmanifest in VS Solution Explorer.
In this panel you can find application details below,
• Application UI which is related to Application User Interface on Metro UI, name, description, tile and notification information. • Capabilities which contains application capabilities list • Declarations which contains system contracts information and details • Packaging contains developer account, application information and more.