dock is your main navigation tool for opening applications and folders.
Here in the System preferences
you can customize it to suit your needs. The first choice is the size,
which you can make smaller or bigger. The next choice is magnification,
which if you check this box, it will magnify each icon as you scroll
over it. This helps if you have a lot of icons and your dock is small
or if you have a small screen. You can also position the dock on the
left bottom or right of your screen. Minimize refers to how it looks
when you minimize a window. Animate opening applications is useful
because it lets you know that you have successfully opened an application.
hide and show
dock will hide the dock if you’d like, and it reappears when
you mouse over it. This feature is useful if you have a small screen,
as a laptop, or dislike looking at all those icons on your desktop.