Why is a Mac so different compared to a Windows PC

Here are a few examples.

The Package
When you buy a Mac, you get the hardware and software in one buy.
Mac OS X offers software for most of the common things you want to do on a computer. Think of browsing the internet (or intranet), email, word processing, processing of photo's, video and audio, etc., even blogging and podcasting.
There is even more software installed and ready for use, for instance Chat, an Apache web server, text-to-speech, speech recognition, network & disc utilities and much more. Mac OS X provides CD or DVD burning software too.
The Mac has Built-in AirPort Extreme wireless networking (802.11b/g), Bluetooth, Ethernet, USB & FireWire. Configuration and management is simple and user friendly.

Security
A built-in personal firewall protects the system from attacks via the network or the Internet. Installing new software requires administrator privileges and user authentication.
Mac OS X is multi-user (like Windows XP) and has its limits on what the several user account types can do. A basic user can not harm the whole system or other users, only itself.
The so called Keychain stores all your information that is needed to use encrypted disk images and log in onto file servers, FTP servers and Web servers. Other users on the system cannot access your Keychain or its data.

Search & find
Spotlight search is the advanced fast desktop search engine for the Mac. It not only recognizes file names but also knows the content and meta information of each file that was indexed. (For example, “date:yesterday” finds and serves a list of all files that were opened yesterday.) File and document contents are automatically indexed.
N.B. Watch the Spotlight demo on the Apple - Mac OS X site.

Finder/Smart Folders
With Finder (more or less comparable with Windows Explorer) you can search for all documents matching one or more criteria. (For example, opened this week, with the keywords ‘project’ and ‘work’ and containing a specified string.)
Each 'search' can be saved as a Smart Folder. Opening a Smart Folder shows documents grouped together based on the search criteria defined by you. The contents of the Smart Folder will be dynamically updated everytime you add new files to your Mac.

Switching windows
Exposé offers Instantly access any open window with a single keystroke.
The same goes for creating an overview of the several windows used by the active application (and switching between them) can be done with a single keystroke.

Dashboard
Widgets provide you with information about your system or from the web. Home to these widgets is Dashboard. Whatever you are doing on the Mac, with one keystroke the Dashboard appears complete with the widgets of your chioce. With the same keystroke it disappears again.
N.B. Watch the Dashboard demo on the Apple - Mac OS X site.

Install/uninstall applications
Most applications arrive in a disk image with a .dmg (i.e. 'disk image') extension. When you double click a disk image file, it will ‘mount’ onto your Mac’s desktop. You can open it like a normal folder. Inside it shows the application. To install it, drag the application into your Applications folder. Other applications arrive as an installer. In this case just double-click the installer and your 'app' will be installed after OS X double-check with you by requesting your password. Uninstall by dragging the 'app' into the Trash.