(i) When you click the Start tab at any moment, you will get the AutoCAD 2016 Initial screen again.
(ii) Using it, you can start a new drawing, open an existing drawing, etc.

Panels have two states-either docked or floating. By default all panels in the Ribbon are docked in their respective tab.

The title bar contains the program name (Autodesk AutoCAD 2016) and the title of the current drawing.

(i) The Search bar displays at the top of the Application menu.
(ii) It is used to search for any command.

File-related commands such as
(i) creating a new file,
(ii) opening an existing file,
(iii) saving the current file, saving the current file under a new name and in a different folder,
(iv) exporting the current file to a different file format,
(v) printing and publishing the current file, etc.

The Application menu appears when you click the red "A" called the Application Button.

AutoCAD managers in a variety of industries, including the manufacturing, building, civil, and mapping industries.

AutoCAD software is used by architects, CAD technicians, designers, engineers, project managers, and CAD.

AutoCAD is a commercial Computer-Aided Design (CAD) and drafting software application. It is developed and marketed by Autodesk, Inc.