Polyester spun yarn is a type of synthetic yarn derived from polyester fibers, which are created through a chemical process using petroleum-based materials. Unlike continuous filament yarns, which consist of long, unbroken strands, polyester spun yarn is made by spinning together shorter polyester fibers. 

Acrylic yarn is a synthetic fiber that has gained popularity in the textile and crafting industries as a versatile alternative to natural fibers. It is made from polymers derived from petrochemicals, and its development was driven by the desire to create a cost-effective and easy-to-care-for option for various applications.

Silk yarn is a luxurious and natural fiber derived from the cocoons of silkworms. It is known for its softness, smooth texture, and shimmering appearance, making it one of the most sought-after fibers in the textile industry. Silk has been prized for its elegance and beauty for thousands of years.

Lyocell yarn is a type of fiber derived from wood pulp, often sourced from sustainably managed forests. It falls under the broader category of cellulosic fibers and is considered an eco-friendly alternative to traditional synthetic fibers. Lyocell is known for its softness, breathability, and environmental sustainability.

Modal yarn is a type of textile fiber that is known for its softness, comfort, and versatility. It is derived from beech trees, specifically the cellulose extracted from the wood pulp of beech trees. Modal is considered a semi-synthetic fiber, falling under the category of regenerated cellulose fibers, similar to viscose rayon. 

Wool blended yarn is a type of yarn produced by combining wool fibers with other types of fibers during the spinning process. This blending creates a yarn that inherits the beneficial properties of both wool and the other fiber, resulting in a versatile material with a wide range of applications.

Bamboo yarn is a type of yarn made from bamboo fibers, which are derived from the pulp of the bamboo plant. It is considered a natural fiber and is often praised for its eco-friendly and sustainable qualities. Additionally, bamboo yarns may be blended with other fibers to enhance certain properties. 

Combed cotton yarn is a type of yarn that is derived from natural cotton fibers, which have undergone an additional process known as "combing." This process involves carefully removing shorter fibers and impurities from the cotton, resulting in a yarn that is smoother, stronger, and more luxurious compared to regular carded cotton yarn.

Viscose yarn, also known as rayon, is a type of regenerated cellulosic fiber made from wood pulp or other plant-based materials. It is often considered a semi-synthetic fiber due to its manufacturing process, which involves chemically treating natural materials to create a fiber that shares some characteristics with both natural and synthetic fibers.