Entrelac: The Essential Guide to Interlace Knitting by Rosemary Drysdale is a comprehensive 160-page hardcover book published in 2010 that teaches the modular entrelac knitting technique, which creates basketweave-like textures using only knit and purl stitches. It serves as a valuable resource for knitters of all levels, featuring detailed instructions, clear illustrations, and 20 patterns for various projects like garments, home decor, and baby items, making it an essential guide for mastering this popular style.