Toilet paper is a tissue paper product people primarily use to clean the anus and surrounding area of fecal material after defecation and to clean the perineal area of urine after urination and other bodily fluid releases. It also acts as a layer of protection for the hands during these processes. It is sold as a long strip of perforated paper wrapped around a paperboard core for storage in a dispenser near a toilet. Most modern toilet paper in the developed world is designed to decompose in septic tanks, whereas some other bathroom and facial tissues are not. Toilet paper comes in various numbers of plies (layers of thickness), from one-ply all the way up to six-ply, with more back-to-back plies granting greater strength and absorbency.