Krishna
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Yarn consists of several strands of material twisted together. Each strand is, in turn, made of fibers, all shorter than the piece of yarn that they form. These short fibers are spun into longer filaments to make the yarn. Long continuous strands may only require additional twisting to make them into yarns. Sometimes they are put through an additional process called texturing.


About 15 different types of fibers are used to make yarn. These fibers fall into two categories, natural and synthetic. Natural fibers are those that are obtained from a plant or an animal and are mainly used in weaving textiles. The most abundant and commonly used plant fiber is cotton, gathered from the cotton boil or seed pod when it is mature. 


The Manufacturing of yarn:

                         There are three major spinning processes: cotton, worsted or long-staple, or wool. Synthetic staple fibers can be made with any of these processes. Since more yarn is produced with the cotton process than the other two, its manufacture is described below.


Step 1: Preparing the fibers

step 2: Carding

step 3: Combing

step 4: Drawing out

step 5: Twisting

step 6: Spinning


For detail explanation visit the site

http://www.madehow.com/Volume-3/Yarn.html


https://www.quora.com/How-are-yarns-made