Alright little one, imagine a big field with lots and lots of graves. This field is very special because the people buried here served our country and did great things to make it a better place. This is what we call a national cemetery.
Now, the national cemetery administration is a group of people who take care of all the national cemeteries across the country. They make sure that the grass is cut, the flowers are planted, and that everything looks nice and respectful for the people who come to visit their loved ones.
They also make sure that everything is done with respect and honors the people who are buried there. This means that they have special ceremonies and traditions to show how much they appreciate the sacrifices made by the people buried in the national cemeteries.
So, in short, the national cemetery administration takes care of all the special places where our country's heroes are buried and makes sure they are always well-maintained and respected.