Jan's Computer Basics:

An application or app is another word for a program running on the computer. Whether or not it is a good application depends on how well it performs the tasks it is designed to do and how easy it is for the user to use. That involves the user interface - the way the user tells the software what to do and how the computer displays information and options to the user.

Text Interface

A text interface was all that was available in the beginning. The example below is of PKZIP, which squashes files into smaller size to save space. Notice in the center the command you would have to type to use this program. An actual command line would look something like:
   c:\>pkzip c:\myfiles\newfile.zip c:\docs\report14.doc

A text-based interface means typing in all the commands. If you mistype, you have to backspace to your error, which erases what you already typed. It's hard to have fun this way!

Add-on programs were written, of course, so you could edit what was typed - to the joy of all who had to work with long command lines.

You might be surprised to know that many technical people still work every day in a text interface. Modern text interfaces have lots of cool shortcuts and features. But you still have to spell and type well.