Screen printing is a method of printing designs onto t-shirts and other apparel using a stencil or screen. This technique is ideal for producing large quantities of shirts with the same design. Embroidery involves stitching designs onto apparel using a special machine and thread. Embroidery gives a more professional look than screen printing and is ideal for smaller quantities of apparel or more intricate designs. Both methods are popular for creating custom apparel for businesses, sports teams, and events.