File

A named collection of information that appears to the user a single entity and is stored on disk .A file can contain a programe or part of a program just data or a user-created document .Files may actually be fragmented or stored in amny different places across the disj.The operating system manages the task of locating all the operating system manages the task of locating all the pieces when a request is made to read the file.
file name:The name of file on adisk used so that both you and the operating system can find the file again.Every file in a directory must have a unique name,but files in different directories can share the same name.
File sharing:The sharing of files over a network,or between several applications running on the same work stations .Shared files can be read,reviewed and updated by more than one individual .Access to the file or file is often regulated by pass word protection,account or security clearence or fileclocking to prevent simulations by multi ple user