Sewing is a method of fastening together two pieces of fabric or other materials, using a string interwoven between the two layers. Sewing can be done manually or with a sewing machine. Manual sewing is done using a needle that is passed in and out of the two fabrics, which are placed on top of each other. A thimble is often used to protect the finger that must catch the needle emerging from the cloth.
A sewing machine uses two separate strings, one fed from the top and another fed from the bottom. To begin sewing, these are intertwined by running the machine back and forth a couple of times. Then, the machine sews in one direction, using a metal "foot" to slide the fabric along. Sewing machines have greatly improved the productivity of the clothing industry, allowing sewing many times faster than even the most experienced seamsters.