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Unlike standard lockstitching, which uses a bobbin, overlock sewing machines utilize loopers to create thread loops for the needle to pass through, in a manner similar to crocheting. Merrow's original three-thread overedge sewing machine is the forerunner of contemporary overlocking machines.
You can also use the yarn overs of lace stitch patterns as buttonholes. Such a yarn-over buttonhole will need to be reinforced by overcasting after it is completed. You can also make buttonholes on loose knits by simply slipping the button through the stitch. (This type of buttonhole must also be reinforced.) Which buttonhole you use will depend on the type of garment, how it will be worn, the position of the buttonhole, the size and type of button and your yarn.