Final answer:
The Taskbar is the always visible part of the Windows GUI that contains various functionalities like accessing the Start Menu, searching for files, and managing applications.
Step-by-step explanation:
The always visible part of the Windows Graphic User Interface (GUI) that contains the button to access the Start Menu, search for files and information; pin, open, switch between, and close applications, and a Notification Area that includes the System Tray, Clock and Calendar, and System Notifications (messages) is called the Taskbar.
Learn more about Windows Graphic User Interface (GUI)