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1. processor

   • brains of the computer
     • it processes data
       • carries out instructions
         • processors have a clock speed measured in hertz
           • numbers of cycles per second
             • 1GHz processor executes 1 billion instructions per second
               • 2GHz processors execute 2 billion instructions per second
                 • each processor has a core
                   • processors can be multi-core
                     • they can even be dual core or quad core
                       • processors have cache

2. hertz

   • measured in hertz
     • typical speeds have spanned across MHz and GHz

3. cache

   • used to store something
     • use dot improve the performance of recently accessed data
       • cache shortens access data time

4. embedded system

   • combination of computer hardware and software
     • computer systems

5. clock speed

   • doubling the clock speed will double the number of instructions executed per year