How many versions of Windows XP are there?

There are four main versions of Windows XP, each with its own set of features and target audience:

1. Windows XP Home Edition: Designed for home users, it features basic functionality and a simplified interface.

2. Windows XP Professional: Designed for businesses and power users, it offers advanced features like domain joining, remote desktop, and support for multiple users.

3. Windows XP Media Center Edition: A home-oriented version that focused on multimedia features like DVD playback and TV tuning.

4. Windows XP Tablet PC Edition: Specifically designed for tablet computers, it included features like handwriting recognition and optimized touch screen support.

Additionally, there are several "service packs" released for Windows XP, which are updates that add new features and fix bugs. These include:

* Windows XP Service Pack 1 (SP1): Released in 2002, it improved security and stability.

* Windows XP Service Pack 2 (SP2): Released in 2004, it significantly enhanced security by including Windows Firewall and automatic updates.

* Windows XP Service Pack 3 (SP3): Released in 2008, it contained numerous security and performance improvements.

So, while there are four core versions of Windows XP, the service packs add further complexity to the "number of versions" question.