Sergers are also often called "overlock sewing machines" and used to be found exclusively in industry. With the advent of sufficient technology bringing size and costs down, these machines can now be found in domestic settings. Sergers are capable of an overlock stitch which is not typically available on a basic sewing machine (these usually use the lock stitch). The overlock stitch provides a very strong finish to the edges of fabric - they are ideal for hemming, but are also good for attaching trims or embellishments.
There are frequently discounts on Sergers at Amazon. Check out the deals below: