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                       Operating system             An  operating system  ( OS ) is  system software  that manages  computer hardware  and  software  resources and provides common  services  for  computer programs . All computer programs, excluding  firmware , require an operating system to function. Time-sharing  operating systems  schedule tasks  for efficient use of the system and may also include accounting software for cost allocation of  processor time ,  mass storage ,  printing , and other resources. For hardware functions such as  input and output  and  memory allocation , the operating system acts as an intermediary between programs and the computer hardware, [1] [2]  although the application code is usually executed directly by the hardware and frequently makes  system calls  to an OS function or is interrupted by it. Operating systems are found on many devices that contain a computer – from  cellular phones  and  video game consoles  to  web servers  and  supercomp

                                 Server    In a technical sense, a  server  is an  instance  of a computer program that accepts and responds to requests made by another program, known as a  client . Less formally, any device that runs server software could be considered a server as well. Servers are used to manage  network  resources. For example, a user may setup a server to control access to a network, send/receive e-mail, manage print jobs, or host a website. Some servers are committed to a specific task, often referred to as dedicated. As a result, there are a number of dedicated server categories, like print servers, file servers, network servers, and database servers. However, many servers today are shared servers which can take on the responsibility of e-mail,  DNS ,  FTP , and even multiple websites in the case of a web server. Because they are commonly used to deliver services that are required constantly, most servers are never turned off. Consequently, when serv

                                processor A processor is the logic circuitry that responds to and processes the basic   instructions   that drive a computer. The four primary f unctions  of a processor are   fetch , decode, execute and write back.  The basic elements of a processor: The arithmetic logic unit ( A L U ), which carries out arithmetic and logic   operations   on the  operands   in  instructions .  The floating point unit ( FPU ), also known as a math co processor or numeric co processor, a specialized  co processor  that manipulates numbers more quickly than the basic microprocessor circuitry can. Registers , which hold instructions and other data. Registers supply operands to the ALU and store the results of operations. L1 and L2   cache memory . Their inclusion in the CPU saves time compared to having to get data from random access memory ( RAM ). Most processors today are  multi-core , which means that the IC contains two or more  processors  f

  what is a motherboard of a                 computer A motherboard is the heart of a computer. It is the main printed circuit board present in the computers which holds the main electronic components of the system like the central processing unit and memory and also provides the connectors for other important peripherals. A motherboard is a large system in itself which contains a number of subsystems like the processor and other components. The basic function for which a motherboard is used in a computer is that it holds the important electronic components of the system including the memory and central processing unit and helps in establishing some sort of bridged connection between other internal components of the system. This  well written article about the parts and functions of a motherboard  will give you more information about all the important parts of a motherboard and the functions performed by these parts in proper detail. The understanding of the components and

lan cable    LAN cable  can be any specific type of data  cable  used in computer networking. It technically refers to any  cable  that can only be run a short distance including most kinds of Coax and stuff terminated with a BNC or Ethernet  Cables . how i make a lane cable                         first what you need to make a cable you need this set  Step 1:  Strip the cable jacket about 1.5 inch down from the end. Step 2:  Spread the four pairs of twisted wire apart. For Cat 5e, you can use the pull string to strip the jacket farther down if you need to, then cut the pull string. Cat 6 cables have a spine that will also need to be cut Step 3:  Untwist the wire pairs and neatly align them in the T568B orientation. Be sure not to untwist them any farther down the cable than where the jacket begins; we want to leave as much of the cable twisted as possible. . this is a coding  like see on this image AND Step 4:  Cut the wires as st

dvd and blue ray disk 1st- DVD- Single layer DVDs can store about 4.7 GB of data, which is about two hours worth of movie. These are commonly referred to as DVD-5s. Double layer DVDs, or DVD-9s, can store twice the amount of data at 8.7 GB. This equals about four hours of movie, or one “Lord of the Rings” movie. this is a dvd 2nd- Blu-ray- Single layer Blu-ray discs store approximately 25 GB of data, this equals about two hours of high definition information or 13 hours of standard definition information. Double layer Blu-ray discs can hold about 50 GB equaling about four and a half hours of high definition information or 26 hours in standard definition. Potentially you could put all three “Lord of the Rings” movies on one double layer Blu-ray disc. thanks

blue ray disk Blu - ray  or  Blu - ray Disc  (BD) is a digital optical  disc  data storage format. It was designed to supersede the DVD format, in that it is capable of storing hours of video in high-definition (720p and 1080p) and ultra high-definition resolution (2160p). this is a blue ray disk thanks