Mr. R.D. Sivakumar is an Assistant Professor of Computer Science and Head of the Department of M.Com.(CA) at Ayya Nadar Janaki Ammal College in Sivakasi, India. The document discusses working with folders in Windows Explorer and the Explorer bar. Folders are represented by small yellow icons and contain a plus or minus sign to display or hide subfolders. The Explorer bar contains sections for file and folder tasks, other places to navigate to, and details about the current folder. It allows the user to create new folders, share files, and get information.