SharePoint – InfoPath Form
InfoPath forms are quite user-friendly to work with. They come with lots of default setting for the user to work easily. One of those functionalities is to set Rules. Rules are set of one or more Actions, which are executed when an event gets to fire.
InfoPath form is the SharePoint feature provided to create form without any HTML and CSS code. InfoPath forms are created by the InfoPath Designer tool.
SharePoint Form library is the collection of XML forms (InfoPath forms). SharePoint Form library available in the Site Contents of the site used to create/save/update the InfoPath forms.