Safari: The Mac’s Web browser.

sidebar: The pane on the far left of the Finder window. It contains your network, hard disk, home folder, applications, documents, movies, and more.

Smart Groups: A way to group contacts in your Address Book.

Smart Mailboxes: Searches for e-mail that matches specific search criteria.

Spotlight: The Mac’s search technology.

start-up disk: The boot drive that contains the Mac OS X system you’re using at the moment