A bandana is a square piece of cloth that people wear on their heads or around their necks.
Bandanas are often seen as cool or casual, and they are often worn by people who like outdoor activities.
Examples:
He wears a red bandana on his head.
I tie a bandana around my neck when it's hot outside.
The bandana is blue and has white spots on it.
I use a bandana to keep my hair out of my face when I'm cooking.
I have a bandana with a picture of a big cat on it.
She always wears a bandana when she goes hiking.