Imagine there are two groups of people who live in the same area but don't get along very well. They both believe that the place they live in belongs to them, and they don't want to share it with the other group.
These two groups are the Israelis and the Palestinians, and they have been fighting with each other for a very long time. In 2004, the violence in this conflict was particularly bad, and many people were hurt or killed.
The Israelis and Palestinians have different ideas about how they should live together in their shared land, and they have trouble agreeing on anything. Sometimes they use violence to try and get their way, which is very dangerous and hurts a lot of innocent people.
It's important for both groups to try and find a peaceful way to live together instead of fighting all the time.