Hierarchical storage management

Hierarchical storage management is a way of organizing data, like books in a library. Think of your computer's storage like a library. It has books (data) that need to be stored, but it doesn't have enough room for all of them (memory). So, we need to come up with a way of storing them.

Hierarchical storage management is one way to do this. We organize the data into piles, or layers, called a hierarchy. The top layer, or the highest layer, is the layer with the most important data that we need to access right away. The layers below that contain the data that we don't need to access right away or as often. Then, we can move the data between the different layers. So, if something becomes important and needs to be accessed right away, we can move it to the highest layer, and if something is not as important, we can move it to a lower layer.