The back of a knit stitch is a purl and the back of a purl is a knit. When you knit every row you get garter stitch with purl ridges between the knit Vs - stretch your work down a little and you can see them. When purl every row you get garter stitch too - purl ridges with knit Vs between them. If you alternate a knit row with a purl row, all the knit Vs will be on one side, and the purl bumps/ridges will be on the other side.
sue- knitting heretic