約束と契約
約束とは、多くの場合、信頼関係に基づいて個人間で交わされる口頭または書面による合意です。一方、契約は法的拘束力を持ち、履行されない場合は責任を負います。約束は道徳的責任を重視されますが、契約は法的な義務が発生します。
Promises and Contracts: What’s the Difference? (Similar yet Different #161)
A promise is a verbal or written agreement between individuals, often based on a relationship of trust. A contract, on the other hand, is a legally binding agreement that will hold you liable if not fulfilled. Promises emphasize moral responsibility, while contracts create legal obligations.