Answer: I don't know if I can give a good answer to this question, but I'll try. From what I understand, texture sts refer to types of knitting that produce patterns and forms other than just plain knit or purl. They can be one color or mixed different colors. Texture sts usually produce firm and closed-knit which are opposite to laces which are more looser knits. I hope this helps.
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See above photos for examples of texture knitting patterns.