If you've ever zoomed into a screenshot of an embroidered logo, you may have noticed single threads that connect letters within a word. These threads allow the embroidery machine to keep embroidering rather than stopping between each letter, thus giving the text a cleaner look. Most of the time, these connector threads aren't noticed, but having them decreases the time necessary to run a design while reducing the chance that a letter may unravel.
When setting up a design, a digitizer might lessen the space between letters so connector threads can be used without being seen. But what happens when the lettering is purposely distanced with space between each letter? Then, the embroidery machine must trim after each letter so the spacing is maintained without having visible connecting threads. This generally works, although the additional stopping and starting of the machine can cause problems, and the embroidery may not look as clean when the machine starts again.