In the year 2000, countries around the world joined together to start the biggest ever effort to tackle global problems.
It was the start of a new millennium, which marks a thousand years. Global leaders agreed that we should all do more to fight poverty, so that the new millennium would be better than the last.
189 countries agreed to work together to achieve eight big goals by 2015 - called the Millennium Development Goals.
Jenny has been finding out more about the Millennium Development Goals, and how they aim to help children around the world.