Thread types refer to the various classifications of threads used in sewing and crafting. Common types include cotton, polyester, and nylon, each offering different strengths, textures, and uses. For instance, cotton thread is ideal for quilting due to its softness, while polyester thread is often chosen for its durability and resistance to fading. In addition to material, threads can also be categorized by their weight and thickness, such as heavyweight or lightweight. The choice of thread type can significantly impact the final appearance and functionality of a project, making it essential for crafters to select the appropriate thread for their specific needs.