Operating System: Definitions and explanations page 1 PDF Book

Learn operating system definitions and explanations, OS course terminologies (Page 1) for computer science degree programs.


  1. What is Access Method?
    Access method is a program or a hardware mechanism that moves data between the computer and ...
  2. What is Address Space?
    Address space is the amount of storage/memory that is allocated for all possible addresses of computational ...
  3. What is Address Translator?
    An address translator is a method of concatenating the frame number with the offset part of ...
  4. What is Application Programming Interface (API)?
    Application programmable interface is a set of functions and procedures that allows the creation of applications ...
  5. What is Asynchronous Operation?
    Asynchronous operations also called asynchronous working is where a sequence of operations is executed such that ...
  6. What is Base Address?
    Base address is a unique location in primary storage that serves as a reference point for ...
  7. What is Batch Processing?
    Batch processing is the processing of previously collected jobs in a single batch. batch process jobs ...
  8. What is Beowulf?
    Beowulf is an approach to building a supercomputer as a cluster of commodity off-the-shelf personal computers, ...
  9. What is Binary Semaphore?
    A semaphore can be visualized as a counter that can be incremented or decremented . a ...
  10. What is Binary Tree?
    A binary tree is a data structure in which each node can have maximum of two ...
  11. What is Block?
    A block is a contagious set of bits or bytes that forms an identifiable unit of ...
  12. What is Busy Waiting?
    Busy waiting is a phenomenon in which a process checks repeatedly for a certain condition. it ...
  13. What is Cache Memory?
    Cache memory also known as the cpu memory is a volatile very high-speed static random access ...
  14. What is Central Processing Unit (CPU)?
    Central processing unit (cpu) sometimes referred to as the central processor, but more commonly called a ...
  15. What is Chained List?
    A chained list or linked list is a linear collection of data elements, whose order is ...
  16. What is Client?
    A client is basically a desktop computer or a workstation that is capable of obtaining information ...
  17. What is Cluster?
    A cluster is a group of servers and other resources that act like a single system ...
  18. What is Communication Architecture?
    Communicating architecture is a complex and varied process, varying significantly during the life of a project. ...
  19. What is Compaction?
    Compaction is a process in which the free space is collected in a large memory chunk ...
  20. What is Concurrent?
    Concurrent processing is a computing model in which multiple processors execute instructions simultaneously for better performance. ...
  21. What is Consumable Resource?
    Consumable resources are assets available on machines that can be created or consumed either by the ...
  22. What is Critical Section?
    Critical section is the part of a program which tries to access shared resources. the critical ...
  23. What is Database?
    A database is an organized collection of data. more specifically, a database is an electronic system ...
  24. What is Deadlock Avoidance?
    Deadlock avoidance algorithms try not to allocate resources to a process if it will make the ...
  25. What is Deadlock Detection?
    Deadlock detection is the process of determining that whether a deadlock exists or not. it also ...
  26. What is Deadlock Prevention?
    Deadlock prevention is done by constraining how requests for resources can be made in the system ...
  27. What is Deadlock?
    A deadlock is a situation in which two computer programs sharing same resources are effectively preventing ...
  28. What is Demand Paging?
    Demand paging is a method of virtual memory management. it follows that a process starts its ...
  29. What is Device Driver?
    Device driver is a computer program that operates or controls a particular type of peripheral or ...
  30. What is Direct Access?
    Direct access is the ability to obtain data from a storage device by going directly to ...
  31. What is Direct Memory Access (DMA)?
    Direct memory access is a method that allows an io device to send or receive data ...
  32. What is Disabled Interrupt?
    A disabled interrupt is created by the operating system in order to gain access to internal ...
  33. What is Disk Allocation Table?
    A disk allocation table is a table that an operating system maintains on a hard disk ...
  34. What is Disk Cache?
    A disk cache is a mechanism for improving the time it takes to write to and ...
  35. What is Dispatch?
    Dispatching is done by a dispatcher that is a module that gives control of the cpu ...
  36. What is Distributed Operating System?
    A distributed operating system is a software over a collection of independent, networked, communicating, and physically ...
  37. What is Dynamic Relocation?
    Dynamic relocation is the process of relocating data currently in the computer memory to other parts ...
  38. What is Enabled Interrupt?
    Enabled interrupts are created by operating systems so that the processor works on the interrupt enabled. ...
  39. What is Encryption?
    Encryption is the process of using an algorithm to transform information to make it unreadable for ...
  40. What is External Fragmentation?
    External fragmentation is the various free spaced holes that are generated in either your memory or ...
  41. What is Field?
    A field is an area in fixed or known location in a unit of data like ...
  42. What is File Allocation Table?
    A file allocation table is a table that an operating system maintains on a hard disk ...
  43. What is File Management System?
    The system used by the operating system or program to organize or keep track of files. ...
  44. What is File Organization?
    File organization refers to the logical relationships, among certain records that are part of the file, ...
  45. What is File?
    A file is a record or a set of data. more precisely, a file is a ...
  46. What is First In First Out (FIFO)?
    Fifo (first in first out) is a method for organizing and manipulating data, where the oldest ...
  47. What is Frame?
    A frame could be a storage or central storage frame that is a fixed size block ...
  48. What is Gang Scheduling?
    Gang scheduling is a scheduling algorithm for parallel systems that schedules related processes or threads to ...
  49. What is Hashing?
    Hashing is the transformation of string of characters into a usually shorter fixed-length value or key ...
  50. What is Hit Ratio?
    The performance of memory elements is frequently measured in terms of quantity, this measurement is known ...
  51. What is Indexed Access?
    Indexed access method is a method of file access in which each file has a specific ...
  52. What is Indexed File?
    An indexed file is a computer file that contains an index that allows easy access to ...
  53. What is Indexed Sequential Access?
    Indexed sequential access is a method that modifies the direct access method. basically it combines both, ...
  54. What is Indexed Sequential File?
    Indexed sequential file is a computer file that contains index. the difference in this file and ...
  55. What is Instruction Cycle?
    Instruction cycle is a processor cycle in which one instruction is processed. each cycle processes a ...
  56. What is Internal Fragmentation?
    Internal fragmentation is the wasted space inside a block. the reason of this happening is the ...
  57. What is Interrupt Handler?
    Interrupt handler could be a callback function in an operating system, more specifically in a device ...
  58. What is Interrupt?
    An interrupt is a function of an operating system that provides multi-process multi-tasking. it is a ...
  59. What is Job Control Language?
    Job control language is a language for describing jobs to the operating system. the operating system ...
  60. What is Job?
    A job is a basically a unit of work that a job scheduler gives to the ...