Explanation

• An operating system that allows a single user to perform only one task at a time is called a Single-User Single-Tasking Operating System.
• Functions like printing a document, downloading images, etc., can be performed only one at a time. Examples include MS-DOS, Palm OS, etc.
• Advantage:
  • This operating system occupies less space in memory.
• Disadvantage:
  • It can perform only a single task at a time.