Difference between seasoning and ingredient in Korean
조미료·재료

조미료seasoning
Seasoning (조미료) is something you add to food to make it taste better. It can be salt, pepper, sugar, sauce, or other flavoring ingredients. People use this word when cooking at home, shopping, or talking about the taste of food.

재료ingredient
"Ingredient" means one of the foods you use to make a dish. In Korean, 재료 often means the things you need for cooking, like eggs, onions, or rice. You can use this word when talking about buying food, preparing a meal, or asking what is in a dish.
The difference
재료 is any food item used to make a dish, like meat, tofu, or onions. 조미료 is added mainly to change or improve the flavor.