Can you name different categories of packages in Java language?

In Java, packages can be classified into several categories:

• Standard packages — included in the JDK, for example, java.lang, java.util, java.io.
• External libraries — packages provided by third-party developers, for example, org.apache.commons.
• User-defined packages — created by developers to organize their own code.

Packages can also be divided by purpose:

• API packages — contain interfaces and classes for system interaction.
• Utility packages — utility and helper classes.
• Internal packages — used within a library or application, not intended for external use.