Selvedge comes from "self-edge." It's just an edging of a stitch at the beginning and end of a row to keep it even. Sometimes patterns include them in the stitch count, and sometimes, not.
"Trust the pattern!"
Time flies like an arrow, but fruit flies like a banana.
Hop aboard while we follow the cloud-covered van of knitting harmony, man!! Woooo!! --Hedgehog
IngridKH on Ravelry