A directory is a list of files and directories within a file system, usually organized in a hierarchical structure. It is a way of organizing and storing information on a computer or other device. A directory can contain files and other directories, which can contain more files and directories, and so on. The top level of the directory structure is called the root directory. Directories can also contain metadata, such as the date when the directory was created or modified, and permissions, which control who can access the files and directories within the directory. They are used to organize and structure data on a computer or other device, making it easier to find and access specific files.