What does Jihad [holy war] mean in Islam?

Hi
If you are Muslim or not, please watch this YouTube video about may contains Fighting against US army in Iraq, meaning Jihad in Islam, the video is in Arabic with English subtitle.
Note: [you have to be 18+] to watch 90 minutes.

http://www.youtube.com/watch?v=F51V9hy_E7w


Take care
God bless you
Abu Lahab