Windows Explorer in Windows 7 includes a Jump List that lists the most frequently opened folders for faster access to them. In addition, above the most frequently visited folders are your pinned folders (or favorites).
So what exactly are your pinned folders? A pinned folder is one that you manually add to the Jump List and remains there until you remove it. For those folders you access on a daily basis, one of the options you have for making them more accessible is to pin them to the Jump List.
To pin a folder location, right-click on any folder, either on your desktop or within Explorer, and drag that folder icon to the Explorer shortcut on the Taskbar. A message appears that reads, “Pin to Windows Explorer” before you release the mouse button. The folder will appear under a “Pinned” section of the Jump List. You can remove a folder from the Jump List by clicking the “Unpin from this list” icon on the right side of the panel.