Other forms: divans
A divan is a piece of furniture you might have in your living room — it's a low sofa without a back, sort of like an upholstered bench. Famously, Sigmund Freud's patients reclined on a divan during psychoanalysis.
The word divan comes from Turkish, and its meaning, "long, cushioned seat," evolved from "book of accounts" to "council chamber" and finally to a type of seating that's common in council chambers in the Middle East. Occasionally people mean a bed with box-springs when they talk about a divan, but it usually refers to a seat with cushions for leaning against.