The difference between a roving and a yarn is that a roving consists of untwisted filaments whereas a yarn consists of twisted filaments:

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A roving is a long and narrow bundle of fiber that is mainly used to spin wool into yarn and does not have significant twist, making it softer and less compact. Yarn, on the other hand, is made by twisting fibers together, which adds strength and cohesion, making it suitable for knitting, weaving, and other textile processes.

The Difference Between a Roving and a Yarn Is That