영속성 컨텍스트가, 영속성 컨텍스트인 이유

자바 공식문서에도 Java Persistence API The Java Persistence API (JPA) is a Java standards-based solution for persistence. Persistence uses an object/relational mapping approach to bridge the gap between an object-oriented model and a relational database. The Java Persistence API can also be used in Java SE applications, outside of the Java EE environment. Java Persistence consists of the following areas: 라고되어있네요