root directory
also: /
The topmost directory in the Linux filesystem hierarchy, denoted by a forward slash (/) and serving as the parent of all other directories and files on the system.
The root directory is the starting point of the entire filesystem tree. Every file and directory on a Linux system can be accessed by following a path that begins from /. Unlike Windows, which has separate drives (C:, D:), Linux presents a unified directory structure with a single root.
The root directory contains essential system directories such as /bin (binaries), /etc (configuration), /home (user directories), /var (variable data), and /tmp (temporary files). For example, a file path like /home/user/documents/file.txt starts from root and navigates through subdirectories.
It's important not to confuse the root directory / with the root user account. The root user is the system administrator, while / is simply the filesystem's top-level location.