What is the finder?
The new Finder is OSX is your computer’s main navigation window. To access the Finder window, click the icon on your dock. The sidebar, on the left side of the window lists hard drive, network volumes, removable volumes like CDs, etc. The sidebar also displays your applications and documents folders. You can customize the sidebar with your favorite folders by simply dragging them into the sidebar. There are three types of views in the Finder: icon, list and columns. The icon and list views are similar to those in OS9. Columns view is new to OSX. In columns view, files and applications within folders are displayed in the columns to the right. New columns will appear as long as there are files, folders or applications within the folders.