The difference in Microsoft Windows XP Pro Ed and Microsoft Windows XP SP2 Professional?

I nedd to know the difference in Microsoft Windows XP Professional Edition and Microsoft Windows XP SP2 Upgrade Version.

The difference in Microsoft Windows XP Pro Ed and Microsoft Windows XP SP2 Professional?norton internet security 2008

sevice pack 2

so a firewall

better security

The difference in Microsoft Windows XP Pro Ed and Microsoft Windows XP SP2 Professional?spyware removal

If you are a proffesional than go for XP or Windows 2000 proffesional,it is for personal use as also good for all your needs.
the software
xp SP2 just fixes a lot of known bugs in the original XP Pro.
SP2 means Service Pack 2.

The service packs include some patches or upgrades to the original version of Windows (any versions).

SP2 is the latest version so far.

It helps in fixing some security flaws in the original version of the operating system and/or add additional facility or just make the operating system works faster (slightly).

More information :

A service pack (in short SP) is a collection of updates, fixes and/or enhancements to a software program delivered in the form of a single installable package. Many companies, such as Microsoft or Autodesk, typically release a service pack when the number of individual patches to a given program reaches a certain (arbitrary) limit. Installing a service pack is easier and less error-prone than installing a high number of patches individually, even more so when updating multiple computers over a network.