1. ORM: object relation Mapping
2. Framework: It is to extract some commonly used methods to make a package.
3. Mybatis is transformed from ibatis, which is just an upgrade of ibatis
4. POJO: plain, old java object ordinary, traditional java object
5. Spring does not provide a complete persistence layer framework (to put it bluntly, there is no middle layer that operates with the database), so it can seamlessly connect with most persistence layer frameworks.
6. Hibernate, ibatis, and mybatis all deal with the database, strtus2 deals with the presentation layer (the earliest MVC framework), and spring deals with the business logic layer.