A journal allows you to programmatically control NX. You can use it to add new functionality to NX, or automate your processes.
For instance, if you need to export all the solid bodies from layer 1 to a datestamped file in a certain folder of your network drive, you could go to file -> export, select the bodies, name the file, and press OK. If this is something you will be doing on a daily basis, you might want to create a journal so that it will be done at the click of a button.
Exporting files is just a simple example. If your company creates custom widgets, you can design a custom application to help you with that. Perhaps a custom form will allow the user to input some design parameters, then the program will perform some calculations and create new files as necessary.
If you want examples, look at
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