What is a container in Java?

In Java, a container is an object or framework that manages the lifecycle and dependencies of other objects. Often, a container refers to an Inversion of Control (IoC) container, which injects dependencies (Dependency Injection) into classes, freeing developers from manually creating and linking objects.

For example, in the Spring Framework, the container creates objects, manages their configuration, and links them together, which simplifies testing and maintaining the code.

Containers can also refer to application servers (e.g., Tomcat, Jetty), which manage the lifecycle of web applications, provide an environment for their execution, and offer services (security, transactions, etc.).