Did you know that when you save a file the computer automatically adds a period and three letters to the end of the name you give the file.  In the old days, before the Windows operating system, file names used to look like this:

Technically speaking, file extensions like:  .exe, .bmp, and .log are still being used by your computer.  However they might not always be displayed with the file name.  They are still important because they tell the computer what program to use to open a file.  Below are some common file extensions that you might see and the programs that opens them:

Some file extensions, especially the ones used on the internet, tell you what kind of file something is.  Here are some examples:

If you'd like to see even more file extensions here's a website that claims to list "every file extension in the world" 
http://whatis.techtarget.com/file-extension-list-A/0,289933,sid9,00.html

PRACTICE ACTIVITY:  Look for a file extension in a file name when you're working at your computer today.

TO KEEP ON LEARNING:  To learn more about file extensions try searching the internet for:

File Extensions
Common File Extensions

Have a nice day!

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