An open sandwich, also known as an open-face/open-faced sandwich, bread baser, bread platter or tartine, consists of a slice of bread or toast with one or more food items on top. It has half the number of slices of bread compared to a typical closed sandwich.

A sandwich is a food typically consisting of vegetables, sliced cheese or meat, placed on or between slices of bread, or more generally any dish wherein bread serves as a container or wrapper for another food type. The sandwich began as a portable, convenient finger food in the Western world, though over time it has become prevalent worldwide.