In knitting, the decrease technique of knitting two stitches together is usually abbreviated to K2TOG. It will also be the name of my folk band should I ever decide to start one up, so no stealing. Decreasing your stitches keeps you from just knitting a tube and pulling everything together as tightly as you can. It's how socks get toes and hats get crowns and mittens get.....those ends. Sometimes you don't even decrease stitches to make your object smaller--you just add more stitches in some places and then decrease in other places and then you have have textures or even lace patterns. Watch out now!
But the basic act of knitting two stitches together so that there's one stitch on the needle in its place is, well, basic. It's even simpler with the Knook because the hook helps you pull the yarn through both loops. See for yourself:
Video can also be found here.
There's not much else to say about decreasing. Wait, that's not true. There's not much else to say about knitting two stitches together. And there's not much to say about it because it's a fairly simple decreasing technique. But it's one of millions! Fine, it's one of the several ways you can decrease. Patterns call for different decrease stitches based on the direction of the stitches, the pattern's texture, or (I have a suspicion) the personal preference of the designer. It's pretty dang handy to know different methods of decreasing so that you can have a favorite of your own. I know I can't be the only person who gets excited when instructions say something like "Decrease using whatever technique you like." I like 'Slip as if to knit, K2TOG PSSO (pass slipped stitch over). That one's obviously going to be the name of my prog rock band.
We're gonna be huge, I tell you.
Up next: purling two stitches together!