Do you know these words? platform computer hardware input device output device central processing unit (CPU) memory random access memory (RAM) computer software operating systems file command line dialog box cursor This chapter will cover these important concepts. If you are unfamiliar with most of these terms, click on the lesson button to learn more about them. You can then take a quiz in order to move ahead to the next lesson. You can also take the quiz now and see how well you do. If you want to double-check on a definition for a term you think you know first, click on the word or phrase and check it out in the glossary. Then return to this page and either read the lesson or take the quiz. Go to the lesson! Take the quiz!