A bandanna is a square piece of cloth that can be used as a handkerchief or tied around your neck. When kids dress up as cowboys for Halloween, they often wear a bandanna.
Most bandannas are brightly colored, with a printed paisley pattern, and they're commonly tied around the head or neck, rolled up or folded in half with one corner pointing down. You can use a bandanna as a headband, a handkerchief, a sweatband, or a napkin — but they're most often just worn as an accessory. The word bandanna, or bandana, comes from the Hindi bandhnu, a tie-dye style of dying fabric.