The primary difference lies in the fiber structure. Monofilament nets are made from a single plastic strand (usually nylon), making them nearly invisible underwater and ideal for gillnets. They have lower water resistance but are stiffer. Multifilament nets consist of multiple thin fibers twisted or braided together, offering superior flexibility, higher tensile strength, and better knot security. Multifilament is generally preferred for heavy-duty commercial trawling or cast nets where durability is paramount.