What is the tapestry crochet stitch?

What is the difference between a mosaic and tapestry crochet?

Tapestry crochet uses two, or more, colors in each row. You change colors for each stitch within the rows and carry the unused colors along, inside the stitches. Mosaic crochet uses only one color per row. You make stitches over the previous rows to make the designs in different colors.

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