Combed and Carded yarns are two different methods of processing fiber into yarn. The key differences between the two include:

Fiber Preparation

Combed yarn is made from fibers that have been carefully selected and straightened, while carded yarn is made from fibers that have been separated and randomly tangled together.

Appearance

Combed yarn is known for its smooth and uniform appearance, while carded yarn has a more natural and rustic look.

Strength

Combed yarn is stronger and more durable than carded yarn because the fibers are aligned and compacted during the combing process.

Softness

Combed yarn is generally softer than carded yarn because the short fibers are removed during the combing process, resulting in a smoother yarn.

Uses

Combed yarn is often used in high-quality clothing, such as shirts and dresses, because of its luxurious feel and drape. Carded yarn, on the other hand, is often used in heavier weight fabrics, such as woolen sweaters and blankets, because of its natural appearance and rustic feel.

In conclusion, combed and carded yarns are two different methods of processing fiber into yarn, each with its own unique characteristics and uses. 

The choice between the two depends on the desired final product and the intended use of the yarn.