The Dock, Launchpad, and Mission Control
Launchpad displays all of the apps installed on your Mac. They are arranged into one or more "pages," and you can switch to a different page by using the arrow keys, by clicking and dragging to the left or right, or by using a swiping gesture (if you have a Magic Mouse or trackpad).
To get the most out of Launchpad, you may want to reorganize it. For example, you may want to move all of your favorite apps to the first page so you can open them more quickly. You can also create folders in Launchpad to house similar apps.
You can move an icon from one page to another by dragging it to the right or left edge of the screen. The page will turn, and you can drop the icon on the new page.
If you're used to using an iPad, iPhone, or iPod touch, the process of creating a folder in Launchpad may seem familiar to you. It is essentially the same as creating folders on those devices.