| A | B | 
| Binary | a language of 1's and 0's that computers can understand | 
| Central Processing Unit | handles most of the work that goes on inside the computer; crunches numbers and tells all other parts what to do | 
| Megahertz | how many million times per second the computer can process instructions | 
| ROM | read-only memory; it holds onto the information the computer needs permanently | 
| RAM | random-access memory; more temporary storage | 
| Hard Drive | a box that contains several magnetic disks where all info on the computer is stored in the form of bits | 
| Circuit Board | ties everything together; like keyboards, scanners and printers | 
| Buses | electrical pathways that link internal things in the computer | 
| Sound Card | have analog digital converters that can change bits into sound signals, then back again | 
| Operating System | all of the virtual files and folers and buttons that allow you to interact with the computer | 
| Modem | lets your computer talk to other computers |