Knitting needles are long, slender tools used in the craft of knitting. They come in various materials, including metal, plastic, and wood, and are available in different sizes to accommodate various yarn thicknesses. The pointed ends help to easily pick up and manipulate yarn, while the other end often has a stopper to prevent stitches from slipping off. There are two main types of knitting needles: straight needles and circular needles. Straight needles are used for flat pieces of fabric, while circular needles allow for knitting in the round, making them ideal for projects like sweaters and hats. Each type has its own unique advantages depending on the knitting project.