Laddering is the odd gap that occurs when you switch from knitting on one dpn to the next. No matter how nice your yarn is, that little gap can completely ruin the look of a pair of lovingly hand knit socks, leaving you frustrated.
Of course, there are a few different methods out there to prevent laddering from happening, but I think mine is the easiest for knitters of all skill levels!
Instead of sliding stitches around from one needle to the next and back again, you simply have to alternate the position of your working needle for each round.
Here's a quick video so you can see exactly what I mean.
Easy peasy, right? Happy knitting!