Okay kiddo, let me explain what was happening back in 2003 when some people were protesting against the Iraq war. So, there was a big country called the United States of America and they decided they wanted to go to war with another country called Iraq. They said that Saddam Hussein, who was the leader of Iraq, had some dangerous weapons and he might use them against other countries.
But, some people thought that going to war was not a good idea. They felt that it could cause harm to the people of Iraq and also the soldiers from their own country who would be sent there. They also felt that there might be other ways to solve problems between countries without using violence.
So, they gathered together in big groups of people and marched through the streets. They had signs with messages like "No War for Oil" and "Peace now". They shouted slogans like "Stop the war!" and "Give peace a chance!"
These protesters wanted the government to change their minds and not send soldiers to fight in Iraq. They wanted the leaders of their country to find other peaceful solutions to problems instead of using military force.
The protests were happening not just in America, but in other countries too. People all around the world were watching and talking about what was happening. It was a big moment in history when people were standing up for what they believed in and trying to make their voices heard.