What is Wubi?

What have I learned from all these unexpected occurrences in Ubuntu—such as when the OS refuses to boot? Finding for solutions to my predicaments in the Internet often made me discover new techniques or terms used in Linux. Take for example, Wubi, I didn't pay so much attention to it even if I have used it to install Ubuntu from a CD.

Wubi (Windows-based Ubuntu Installer) is an official Ubuntu installer for Windows users that can install and uninstall Ubuntu as any other Windows application. Simply put, Wubi is the installer for those who want to experiment and get acquainted with Ubuntu without the need of disk partitioning or formatting—Wubi installs Ubuntu within a file in the Windows file system just like any Windows program.

Installing Ubuntu inside Windows XP using wubi.exe is fast and easy—unlike Windows XP which took me two hours—it only takes less than thirty minutes. I must admit though the first time it took longer than that to install because I was doing it the wrong way.

For more info:
https://wiki.ubuntu.com/WubiGuide
http://en.wikipedia.org/wiki/Wubi_%28Ubuntu_installer%29
http://zenit.senecac.on.ca/wiki/index.php/Install_Ubuntu_While_Running_MS_Windows_%28WUBI%29