Final answer:
Masa harina is a type of corn flour that is made from lime-treated corn kernels. It is commonly used in Mexican cuisine to make dishes like tortillas and tamales.
Step-by-step explanation:
Masa harina is a type of corn flour that is commonly used in Mexican cuisine. It is made from lime-treated corn kernels, which are soaked in an alkaline solution to remove the outer hull and soften the kernels. This process, known as nixtamalization, makes the kernels easier to grind into a fine flour. Masa harina is used to make traditional Mexican dishes such as tortillas, tamales, and pupusas.