root

In computing, a root is the highest level of a directory tree, and all other directories are children of the root directory. The term comes from the fact that the root directory is the only directory that is not contained within any other directory. All other directories are contained within the root directory, which makes them its children. The root directory is always given the path “/” ( pronounced “slash”), which represents the highest level in the hierarchy. In Unix-like operating systems, the root user has complete access to all files and directories on the system, making it a powerful account you can use with caution. On most systems, only the administrator has access to the root account, and you should limit access to this account to only those who need it.