Kraft brand marshmallows are not classified as kosher foods. Most brands of marshmallows are not deemed to be kosher and are considered unclean.
The Elyon brands of miniature marshmallows are kosher and classified as clean. Jet puffed marshmallow creme is also kosher.
The word kosher means pure and good. Kosher foods must be prepared in a specific manner and adhere to kosher rules.
In Hebrew kosher tradition many types of foods may not be consumed as they are deemed to be unclean. Kosher dairy products must be obtained from kosher animals. Only meat from cattle and animals with cloven hooves may be consumed under this diet.