What is the Difference Between Lycra and Spandex?

Question: What is the difference between spandex and Lycra fibers? Is there any technical difference? And what are the fabric properties differs for cotton/spandex fabric and cotton/lycra fabric?

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What is the advantage of Lycra compared to other types of spandex for clothes manufacturing? - Quora

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What is the Difference Between Lycra and Spandex? Euphoric Colors is Made in USA Custom Clothing In Los Angeles one stop for all your private label apparel

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What is the advantage of Lycra compared to other types of spandex for clothes manufacturing? - Quora