https://www.w3schools.com/java/java_packages.asp

- Container for related classes (packages help to group classes into meaningful manners)

- concept of windows directories in java (whille windows use `/` java use `.`)

    - example: `com.abc.calculator.util` means `com` directory has child directory `abc`, which has another child directory `calculator` and so on.

- helps to avoid naming collission

​

package mypack;

public class employee 

{

    String empId;

    String name; 

}

​