Double Crochet Link is also known as abbreviations of D-Link. Usually when I talk about this stitch, I simply call it D-Link as it’s easier to roll off the tongue.
With regular double crochet, there are gaps between the stitches. Known as the posts. We’ve come to accept that in crochet and is part of the stitchwork. Sometimes, that look and gapping spaces are not what we want.
Same used Bernat Beyond Yarn. Double Crochet Link connects the posts in two spots along the post as well as the top of the stitch. This gives the illusion that it could be 3 single crochet rounds / rows when it’s just one pass of Double Crochet Link.
Get the written instructions at: http://thecrochetcrowd.com/how-to-double-crochet-link-tutorial/