An Overlock or Serger is a Specialty sewing machine that makes the life of the typical seamster easier and fun. They will not replace a standard sewing machine as they have limited but important functions. Overlock/Serger perform the finishing stitches sewers want and need, as well as many decorative stitches.
All sergers perform one task perfectly–overlocking, cutting and finishing seams inone step. The options are not the same on all overlock machines. Some may perform more tasks and decorative stitches. These machines can handle knits and many delicate fabrics with ease.
Some have up to eight spools of thread which gives the user many options.
In addition to the overlocking stitch, the serger is usually capable of performing the flatlocking stitch and the chain stitch.
More expensive machines will also perform a cover stitch.