This document provides information on different types of sewing machines and their uses. It discusses mechanical, electronic, and computerized sewing machines. Mechanical sewing machines are hand-powered while electronic machines are foot-pedal powered. Computerized sewing machines have LCD displays and can store stitch patterns. The document also covers overlocker machines which are used to finish fabric edges. Various other specialized machines are outlined like embroidery, buttonhole, and bartacking machines. In summary, the document categorizes and describes the main types of sewing machines and their functions.