UNIT-5 Explain Directory Structure. A directory is a container that is used to contain folders and files. It organizes files and folders in a hierarchical manner. There are several logical structures of a directory, these are given below. · Single-level directory – The single-level directory is the simplest directory structure. In it, all files are contained in the same directory which makes it easy to support and understand. A single level directory has a significant limitation, however, when the number of files increases or when the system has more than one user. Since all the files are in the same directory, they must have a unique name. if two users call their dataset test, then the unique name rule violated. Advantages: · Since it is a single directory, so its implementation is very easy. · ...