Garter stitch creates a textured, squishy fabric characterized by “garter ridges”. It is identical on both sides.
When worked flat, garter stitch is formed by knitting every row. In the round, it is formed by alternating rows of knit and purl.
Garter stitch is reversible and has no wrong side. Every two rows of garter stitch forms a single "garter ridge", highlighted in the picture below: