Sweet cookie: concave impression, smooth appearance, pinholes, crisp taste and layered cross section.

Crispy biscuit: embossed, porous cross-section without layers, crisp taste.

Sweet and crisp biscuits: modelling technique is diverse, with clear cross-sectional pores and crisp and smooth taste.

Fermented biscuits: smooth appearance, pinholes, clear cross-sectional hierarchical structure, loose taste and fermented fragrance.

Sandwich biscuits: there are flavor fillings between biscuits, with diverse tastes.

Biscuits of different colors: Wafer biscuits are made up of multiple layers of dough, which are extremely crisp and melt in the mouth.

Egg biscuit: made of flour paste containing eggs, with loose structure and crisp taste.

Egg roll: a multi-layered cylindrical product made of multi-layered pulp containing eggs, which has a crisp taste.

Oreos should belong to sandwich biscuits.