Difference between practical use and effect in Korean
활용·효과
활용practical use
활용 means using something in a useful or practical way. You use it when a person takes an object, idea, time, or skill and uses it for a purpose. It is often seen in the form 활용하다, which means "to make practical use of" something.
효과effect
Effect means the result or change caused by something. You use it when an action, medicine, study method, or product helps, changes, or influences a person or situation. In Korean, 효과 is often used with 있어요 or 없어요 to say something works or does not work.
The difference
효과 is the result or benefit you get. 활용 is the act of using something, often to create a good result.