Alot of times while working on a quilt you'll find yourself piecing and sewing together the same type of block combination over and over...and over. It can become quite tedious and boring.
To help speed it along you can "chain" your blocks together!
Chaining blocks is exactly like it sounds. As you finish sewing the piece you were working on simply sew a couple of stitches out from the end of the last piece (don't worry it won't hurt your machine) and then add the next identical block combination and sew that one together, so on and so forth. There is no need to stop the machine and cut threads for each tiny piece. You can see in the picture above that there is a space between each block and each block is connected with thread thus chaining them together.
Once you finish sewing the all the identical block pieces together you'll be left with something that resembles a wonky kind of bunting. Lay your sewn pieces flat and cut the thread between each block piece. Presto! You've sewn several bits of fabric together much faster with less fuss. Plus it's kind of fun especially when your blocks start to get bigger.
You can see in this picture that I still needed to add another piece to the other side. I did the same thing with these and chained them together, and then cut the extra thread between each piece when they were all done .
Here's a video to help you visualize it (I personally do not recommend sewing over your needles and no that is not me ^_~):