The National Climatic Data Center is a place where people go to learn about the weather and climate. It's like a big library where they keep records of all kinds of weather information. Think of it like a big bookshelf where there are books with information about the weather from many different years and places.
For example, if you wanted to know what the temperature was like in your city five years ago on a certain day, you could go to the National Climatic Data Center and they would have that information for you. They keep track of things like temperature, rainfall, wind, and other important weather things.
Scientists and researchers also use this information to learn about how the weather has changed over time and how it affects things like the environment, plants, and animals. So the National Climatic Data Center is a really important place for people who want to understand the weather and its impact on the world around us.