Key FunctionsUnlike a standard sewing machine, a serger is designed to:Trim and Finish: It uses built-in blades to trim the raw edges of fabric while simultaneously encasing them in thread.Prevent Fraying: It creates professional-looking seams that will not unravel, which is ideal for garment construction.Handle Knits: Many models, including this 4-thread unit, are excellent for sewing stretchy fabrics.Machine FeaturesThread Capacity: This model uses four threads (indicated by the four tension dials on the front) to create strong, flexible seams.Differential Feed: Similar models, like the Elna T34D, often include a differential feed adjustment to prevent fabric from puckering or stretching while sewing.Threading System: It typically features a color-coded threading guide to help manage the multiple thread paths