Okay kiddo, imagine you have a huge library with books about everything in the world. Now, imagine that library is a website called PubMed.
PubMed is like a big online library where you can find lots of information about health and medicine. There are millions and millions of articles and research studies on PubMed, all written by really smart doctors and scientists.
Let's say you have a question about a certain disease, like the flu. You can type the word "flu" into PubMed's search bar and it will show you all of the articles and studies that have been written about the flu.
But, just like in a real library, not all of the books are easy to read or meant for kids. Some of the articles on PubMed might use big words or be really complex. That's why it's important to have an adult help you if you want to use PubMed to learn more about health and medicine.