The primary ingredient in s'mores is marshmallows. S'mores consist of roasted marshmallows sandwiched between two pieces of graham crackers and a layer of chocolate. This beloved treat is especially popular in camping and outdoor settings, as it symbolizes a sense of community and togetherness. The combination of textures and flavors creates a delightful experience, making s'mores a nostalgic and cherished dessert in many cultures.