A day without orange juice is like a day without sunshine
The wordspacing you use will affect the overall appeareance of the printed piece, its legibility, and the amount of copy that will fit in a given space. Wordspacing is measured in units and can be specified by the designer. However, unless you are very familiar with a particular photo typesetting system, you may find it convenient to use the following general terms; normal, loose, tight, and very tight.