Satin stitches lie side by side with no visible gaps, each one spanning the full width of the column. Because the thread lies long and flat, it catches the light and gives embroidery its classic sheen. Most embroidered text, logo outlines and patch borders are satin, and 3D puff is built entirely from it.
Width sets the limits. Columns that are too narrow cannot form clean stitches, which is why tiny lettering struggles. Columns that are too wide leave long, loose stitches that snag and lie unevenly, so digitizers switch wide areas to a fill stitch or split the satin into shorter rows.
If your logo has thin strokes or very small type, ask the digitizer whether it will hold in satin at your size or whether the art needs thickening. The embroidery digitizing guide explains how stitch types are chosen.