The internal memory of a tablet is the most important thing when it comes to storage, as some content has to be stored on it, but having a memory card slot can help reduce the strain on this. As cameras improve so does the file size of the pictures and videos they take increase. These files can use up increasingly larger amounts of internal memory, so being able to store these, and other content, on an external memory card means that more of the internal memory is left usable.
The Tagital T7K does come with a micro SD card slot. This can take cards up to 32 gigabytes in size, a pretty standard amount seen in the majority of children’s tablets.