This makes it easy to group files that go together instead of having a million files all over the place. For example you might have a work folder, a family folder, a fun folder, a recipe folder. Most applications will create a folder to keep all relevant files together. In Windows these actually look like tiny manila folders. When you type up a letter in a word processing program, you are creating a file.
All web pages are a mixture of html and various graphic files.
Files have extensions that identify their purpose or what application that they are attached to. This web page is called index.html . The file that launches Netscape is called netscape.exe . Double-click on files to start them 7. Made Easy, 2nd ed.