How to customize the Dock on your Mac

[iMore.com]

The OS X Dock is a convenient way to launch apps and access the files and folders you use most frequently.
When you first launch OS X Yosemite, the Dock comes pre-filled with many of the standard apps Apple includes: Mail, Safari, Launchpad, Mission Control, and more. You can customize the Dock with any apps you like, however. What's more, you can adjust the Dock's size, its location, and its behavior.

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