Okay, imagine you want to make something happen in your town, like cleaning up the playground or starting a club for kids who like to draw. You might need help from other people, right?
The Center for Citizen Initiatives is a group that helps grown-ups in different countries work together to make good things happen. They help people from the United States and Russia (and sometimes other countries) talk and share ideas with each other so they can work together to solve problems and create new things.
It's like if you and your friend from another school wanted to work on a science project together. You might talk over the phone or video chat to come up with ideas and share your work. That's kind of what the Center for Citizen Initiatives does, but with grown-ups and on a bigger scale.