Kellogg's introduced Rice Krispies cereal in 1928.
The cereal was developed by Kellogg Company researchers and is made from crisped rice. Its best-known feature is the sound produced when the grains meet milk, represented in advertising by the words “Snap! Crackle! Pop!”
Rice Krispies first appeared in the United States during a period when ready-to-eat cereals were becoming common household breakfast foods. Kellogg's marketed the product as a convenient cereal that could be served directly from the box with milk.
The cereal is often confused with Rice Krispies Treats, the no-bake confection made by combining the cereal with melted marshmallows and butter. The cereal itself predates that recipe by decades; the commercial treat became popular later in the twentieth century.