Files
A File is a contiguous group of bytes. For instance, your resume would be contained in a single File. Every File must have a name. Filenames cannot contain the characters
* | \ < > " ? /
Files are also designated by their type. For instance, your resume may have been created in Microsoft Word, but your budget may have been created in Mocrosoft Excel. Files are given an extension, such as .doc, .xls, .pdf, .jpg, .bmp. The extension is located after a period, which is placed between the extension and the filename.
You do not have to type the extension or period when naming a file. The computer program you are working in will perform this operation for you.
Examples of filenames would be:
filename.doc
My file.doc
Letter to Mother.doc
Monthly Budget.xls
Dog.bmp
File Storage
Files are stored on disks. The floppy disk (called "floppy" because inside the plastic casing there is a flexible disk) is placed in the A: drive and the hard disk inside the computer is generally the C: drive.
Folders 
Folders can be created on storage disks to help organize information. Folders have an icon resembling a file folder. An example of a folder is "My Documents."
"My Documents" folder is located on the hard disk C:. In most computer programs, "My Documents" is the location where files will be stored.
If you want to change the location of where files will be stored, you must make sure that the disk you would like to store your information on is the designated disk.