1. OPERATING SYSTEMS, FILE EXTENSIONS, AND THE INTERNET

2. OPERATING SYSTEMS AN OPERATING SYSTEM IS THE MOST IMPORTANT SOFTWARE THAT RUNS ON A COMPUTER. IT MANAGES THE COMPUTER'S MEMORY, PROCESSES, AND ALL OF ITS SOFTWARE AND HARDWARE. IT ALSO ALLOWS YOU TO COMMUNICATE WITH THE COMPUTER WITHOUT KNOWING HOW TO SPEAK THE COMPUTER'S LANGUAGE. WITHOUT AN OPERATING SYSTEM, A COMPUTER IS USELESS!

3. THE OPERATING SYSTEM’S JOB YOUR OS MANAGES ALL OF THE SOFTWARE AND HARDWARE ON THE COMPUTER. MOST OF THE TIME, THERE ARE MANY DIFFERENT COMPUTER PROGRAMS RUNNING AT THE SAME TIME, AND THEY ALL NEED TO ACCESS YOUR COMPUTER'S CPU, MEMORY, AND STORAGE. THE OPERATING SYSTEM COORDINATES ALL OF THIS TO MAKE SURE EACH PROGRAM GETS WHAT IT NEEDS.

4. GUI’S MODERN OPERATING SYSTEMS USE A GRAPHICAL USER INTERFACE, OR GUI (PRONOUNCED GOOEY). A GUI LETS YOU USE YOUR MOUSE TO CLICK ICONS, BUTTONS, AND MENUS, AND EVERYTHING IS CLEARLY DISPLAYED ON THE SCREEN USING A COMBINATION OF GRAPHICS AND TEXT. EACH OPERATING SYSTEM'S GUI HAS A DIFFERENT LOOK AND FEEL, SO IF YOU SWITCH TO A DIFFERENT OPERATING SYSTEM IT MAY SEEM UNFAMILIAR AT FIRST. HOWEVER, MODERN OPERATING SYSTEMS ARE DESIGNED TO BE EASY TO USE, AND MOST OF THE BASIC PRINCIPLES ARE THE SAME.

5. HOW DOES THE COMPUTER KNOW WHICH PROGRAM TO USE WHEN OPENING MY FILE?

6. WHAT IS A FILE EXTENSION? A THREE CHARACTER ADDITION TO A FILE NAME THAT INDICATES WHAT TYPE OF FILE IT IS AND WHAT PROGRAM CAN BE USED TO OPEN THE FILE.

7. .DOC OR.DOCX MICROSOFT WORD FILE USED FOR WORD PROCESSING DOCUMENTS YOU CAN MAKE CHANGES TO THIS TYPE OF DOCUMENT

8. .HTM OR.HTML WEB PAGE FILES CONTAINING HTML OR OTHER INFORMATION FOUND ON THE INTERNET

9. .JPG OR.JPEG PICTURE FILE

10. .MOV FILE USED WITH QUICK TIME TO DISPLAY A MOVIE

11. .MP3 OR.MP4 FILE USED FOR AUDIO OR VIDEO FILES

12. .PDF ADOBE ACROBAT READER FILE YOU CAN VIEW A DOCUMENT BUT NOT MAKE CHANGES TO IT

13. .PIC AND.PNG PICTURE FILES

14. .PPT POWERPOINT FILE

15. .PSD PHOTOSHOP FILE

16. .WMV WINDOWS VIDEO FILE

17. .XLS EXCEL SPREADSHEET FILE

18. HOW TO FIND THE FILE TYPE 1.OPEN FILE EXPLORER 2.OPEN THE FOLDER 3.CLICK ON 4.SELECT DETAILS FROM THE DROP DOWN BOX.