What is difference between gridview and form view?

The GridView control displays data as a table and provides the capability to sort columns, page through data, and edit or delete a single record. the GridView control offers improvements such as the ability to define multiple primary key fields, improved user interface customization using bound fields and templates, and a new model for handling or canceling events.

The FormView control renders a single record at a time from a data source and provides the capability to page through multiple records, as well as to insert, update, and delete records, similar to the DetailsView control. However, the difference between the FormView and the DetailsView controls is that the DetailsView control uses a table-based layout where each field of the data record is displayed as a row in the control. In contrast, the FormView control does not specify a pre-defined layout for displaying a record. Instead, you create templates that contain controls to display individual fields from the record. The template contains the formatting, controls, and binding expressions used to lay out the form.