A few functionalities of Operating Systems are as follows:

• Provides a user interface: Operating systems serve as a link between computer hardware and the people who use it. It allows the user to access the hardware in a methodical fashion.
• File Management: To make navigation and usage more effective, a file system is organized into directories. These directories may include additional directories and files. AMONG other things, the operating system keeps track of where data is stored, user access settings, and the condition of each file.
• Security: Password protection and other security features are used by the operating system to protect user data. It also guards against UNAUTHORIZED access to PROGRAMMES and user data.
• Maintains system performance: By keeping an eye on the overall health of the system, it might help you get more out of it. Keep track of the time between service requests and system RESPONSES to get a complete picture of the system's health. This can help with performance by providing important information for debugging.
• Memory Management: The operating system is in charge of the primary memory, also known as main memory. The main memory is made up of a large number of bytes or words, each with its own address. Main memory is a type of fast storage that the CPU can directly access. Before a programme can be executed, it MUST first be loaded into the main memory. An operating system manages memory by performing the following tasks:
  • It keeps track of primary memory, that is, which user programmes use specific memory bytes. Memory addresses that have already been assigned as well as those that have not yet been used.
  • In multiprogramming, the OS sets the order in which processes are allowed memory access and for how long. When a process requests memory, it is allocated, and memory is released when the process quits or performs an I/O activity.
• Error detection: The operating system continuously monitors the system in order to detect errors and keep the machine from failing.
• Device Management: Drivers are used by an operating system (OS) to handle device connectivity. It keeps track of all of the system's connected gadgets. The Input/Output controller is a programme that manages all of the devices in the system. Determines which processes and for how long are permitted access to a device. Devices are distributed in an effective and efficient manner. A device gets deallocated when it is no longer required.
• Processor Management: The operating system determines the order in which processes access the processor and the amount of processing time each process has in a multiprogramming environment.