Microsoft InfoPath is an XML-based toolset of electronic forms software that integrates with SharePoint 2007 and later and Office applications. In 2014 it has been announced that InfoPath will no longer be developed by the vendor. Mainstream support is promised until 2020.
Microsoft Office InfoPath is a software application for designing, distributing, filling and submitting electronic forms containing structured data.
Microsoft InfoPath 2010 Designer enables you to design a variety of forms that can be filled out in a Web browser and InfoPath Filler. To start designing an InfoPath form, launch the InfoPath 2010 Designer, and select from a gallery of templates on the File tab, in the New section. The templates are divided into the following categories: Popular Form Templates, Advanced Form Templates, InfoPath 2007 Form Templates, and Template Parts. And, each of these categories lists a number of form templates to select. You can read more about infopath, here.
Questions having the tag infopath should address the use and configuration of InfoPath in a SharePoint environment: consuming data from SharePoint, publishing and using form templates in InfoPath Forms Services, configuring InfoPath Form WebPart.
InfoPath 2013 Client is slated to be supported till April 2023 as per this Microsoft blog posting - Update on InfoPath and SharePoint Forms
