Microsoft InfoPath is a software application for designing, distributing, filling and submitting electronic forms containing structured data. The product features a WYSIWYG form designer in which the various controls (e.g. textbox, radio button, checkbox) are bound to data, represented separately as a hierarchical tree view of folders and data fields. All the data stored in InfoPath forms are stored in an XML format. Secondary data sources can be built into the form or they can be accessed through an external data connection to SharePoint or a Web service.