Indicates that something changes or is done in accordance with or depending on some condition, standard, or situation ("depending on ~").
収入に応じて税率が異なります。
Tax rates differ depending on income.
年齢に応じて服のサイズを選んでください。
Please choose clothing sizes according to age.
需要に応じて生産量を調整します。
We will adjust production according to demand.
状況に応じて対応策を変更する必要がある。
It's necessary to change measures according to the situation.