When working short rows you can shape the garment by making soft curves or give a better fit by creating bust darts.
Short rows are partially worked rows before turning. By turning with a wrap you avoid a hole at the turning point.
Short row from WS: Work number of sts told in pattern, slip following st purl-wise, place yarn in back of work, slip st back on left needle, turn and work the row back. When working next row and getting to the st with wrap; work wrap and stitch together as one stitch and then finish row.