The amount of internal memory a tablet has can determine just what it is capable of. Some internal memory is always taken up by the operating system, and some part of every app will also use the memory. Downloaded and user created content, such as photos and videos taken with a camera, can be stored on a memory card, but internal memory is what truly limits a tablet.
The Fire HD 10 Kids Edition comes with 32 gigabytes (GB) of internal memory, with 25.3 GB of that stated to be usable (as mentioned, the OS will take up some memory). This is still comparatively high for a children’s tablet, as many come with less, which means that more content can be stored internally. It also comes with a memory card slot that can be used for content such as books, photos and videos.