Open one of the saved files in WordPad to see what it looks like. It's in binary form, so will be unreadable gibberish. Can you think of a way to save and load files that are written in readable text form? It can be done, though it takes some extra work. Figuring out how to do it is a good research project. The virtue of having files in readable text form is that you can edit them so as to change the nature of the objects being loaded; of course, there are risks to doing this as careless edits may make the file unreadable. But when developing a program, editable text files can provide a useful debugging tool as well as a kind of 'meta-interface' to the program.