Many of the apps on your Mac have a toolbar; that’s the gray section at the top of the window that contains a number of buttons and, perhaps, a search field. You see this in Safari, Mail, the iWork apps (Pages, Numbers, Keynote), and even in the Finder. The buttons available in these toolbars let you quickly access some of the most common functions of their apps.
Tweaking the Finder toolbar can help you become more productive. You can add buttons for functions you use often, ones that might be harder to access via menus. You can add a specific button that offers most of the same menu items as the Finder’s contextual menu; this is great if you’d rather click a button than right-click or Control-click. And you can use the back and forward buttons to move through windows or tabs you’ve viewed, and use the Finder view buttons to change Finder views.
Read more here:: How to use the Finder window toolbar to save time