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At its core, a serger machine is designed to finish the edges of fabric. It combines several functions—trimming, sewing, and overlocking—into one operation. Unlike a traditional sewing machine, which typically uses a single needle and one or two threads, a serger can use multiple threads (usually 3 or 4) to create a secure seam. This capability allows it to produce stitches that not only hold layers of fabric together but also prevent fraying and unraveling.

A dual needle sewing machine is equipped with two needles that work simultaneously to create two parallel lines of stitching. This setup allows for decorative and functional sewing techniques that are difficult to achieve with a single needle. The dual needles are placed in a single needle bar, making it easy for sewers to switch between traditional and double stitching without any complex setup changes.