The fibers which are used for the production of yarn and fabric are called textile fibers. There may be different types of fibers that look like textile fibers but all the fibers are not textile fibers. To be a textile fiber it should have some of the essential characteristics like minimum length to insert twist, strength, fineness, cohesiveness, rigidity or stiffness, elongation and elasticity etc. Different types of textile fibers are used in the textile industry. Some of them we get from natural sources and some of them are man-made.

For Physical Properties Its have to some of the following properties-- Length, Fineness, Crimp, Maturity, Lecture, Softness, Flexibility, Toughness, Elongation, Friction

For Chemical Properties its have to some of the following properties – Action with acid, Action with alkali, Action with bleaching, Action with organic solvent, Sunlight preventive power, Heat preventive power etc.

For Structural Properties its have some of the following properties – Fine structure and Appearance, Micro structure

 So we can say that, if we want to judge a yarn as a textile fiber, it should have some of the above properties.