Computer

Computer

1. two main parts

   • Hardware
     • Tangible parts
       • Processor
       • Input/output devices
       • memory
         • data and instructions needed by the CPU to do its appointed tasks can be found
           • Primary memory
             • closely connected to processor
             • hold programs and data recently worked by the processor
             • Expensive
             • volatile
             • Fast
             • small storage
           • Secondary memory
             • Cheap
             • non-volatile
             • Slow
             • connected to main memory
             • huge capacity
   • Software
     • intangible parts
     • program that a computer uses in order to work
     • kept on hardware device
     • programs acts like instructions for the processor
       • Types of computer programs
         • System programs
           • needed to keep all hardware and software systems running
             • Operating system (most important
             • Networking system
             • Database system
             • Programming language software
             • web site server
             • data backup
         • application programs
           • used to get work done
           • word processor
           • game programs
           • Spreadsheets