Java's API offers a variety of prewritten tools, such as classes, interfaces, and packages, providing essential functionality for developers.
It includes Core, SE, EE, and ME APIs, as well as the Collection, Stream, I/O, Concurrency, JDBC, and JPA APIs.
Besides of the Spring terminology, when we start with Spring we start to hearing about Spring boot, Spring Cloud, Spring MVC, Spring AOP, etc. and then we don't know how to start and in the worst of the case we drop it to learn it. So, we can continue explaining those modules, project, etc. so let's begin with the Spring Architecture.