A computer file system

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Parent Directory

The higher directory is called the parent directory, and the lower directory is called a subdirectory.

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Directory

a book listing individuals or organizations alphabetically or thematically with details such as names, addresses, and telephone numbers.

Folders

an icon on a computer screen that can be used to access a directory containing related files or documents.

Directory Tree

is a hierarchy of directories that consists of a single directory, called the parent directory or top level directory, and all levels of its subdirectories (i.e., directories within it). ... Thus, a typical computer contains a large number of directory trees

Computer file

is an object on a computer that stores data, information, settings, or commands used with a computer program. In a graphical user interface (GUI) such as Microsoft Windows, files display as icons that relate to the program that opens the file.

Operating System

the software that supports a computer's basic functions, such as scheduling tasks, executing applications, and controlling peripherals.