Difference between to tighten and to strengthen in Korean
조이다·강화하다
조이다to tighten
To tighten means to make something less loose and more secure. In Korean, 조이다 is used when you turn, pull, or fasten something like a cap, lace, belt, or screw. You can use it for many everyday actions at home, at school, or while traveling.
강화하다to strengthen
To strengthen (강화하다) means to make something stronger, safer, or better. You can use it for physical things like muscles or doors, and also for things like security, rules, or practice. It is used when something needs more power, support, or protection.
The difference
강화하다 means to make something stronger, like security, rules, or a team. 조이다 is about making something physically tighter, like a belt or a lid.