Directories in Unix were/are files that just contain pointers to other files. So they are a bit like a directory in a building. However, "folder" is probably an

Directories in Unix were/are files that just contain pointers to other files. So they are a bit like a directory in a building. However, "folder" is probably an improvement if you think in terms of it _containing_ other things. Folders are still recognizable real things. Ask any hipster. Now let's talk about folders that contain other folders and so on. There is where the physical metaphor gets strained. Still, it's fine and quite contemporary.