It can be used to describe a lifestyle of a person of African descent and/or their hair in it's unaltered state by not putting chemicals (relaxers, perms, texturizers, dye) or heat applications (hot combs, flat irons, curling irons) in or on their hair to change the texture and/or color of their hair.
People of African descent describe their hair as kinky, coily and curly.
There is much debate about whether the word naptural means 100% unaltered hair or not.
Many napturals color their hair with commercial dyes and still consider themselves naptural, which is accepted within the naptural community.
Many napturals also use henna, which is a flowering plant used as a natural, permanent dye to color hair.