When to use development in Korean
Korean: 발전[ bal-jeon ]

When to use it
Development (발전) means growth, progress, or improvement over time. You can use it when talking about cities, science, technology, or a person's progress. In nature topics, it can also describe how an area changes as people build more or improve it.
Example sentences
이 도시는 발전이 빨라요.
This city is developing quickly.
과학 발전은 우리 생활을 바꿔요.
Scientific development changes our lives.
선생님은 학생의 발전을 칭찬했어요.
The teacher praised the student's progress.
이 지역은 발전이 빨라서 새 가게가 많아요.
This area is developing quickly, so there are many new shops.
여행 중에 그 나라의 발전을 봤어요.
I saw the country's development during my trip.
자연을 지키는 발전이 중요해요.
Development that protects nature is important.