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Joseph Wasden20,406 Points
Behold, the google hath spoken!
"A package is a namespace that organizes a set of related classes and interfaces. Conceptually you can think of packages as being similar to different folders on your computer. You might keep HTML pages in one folder, images in another, and scripts or applications in yet another. Because software written in the Java programming language can be composed of hundreds or thousands of individual classes, it makes sense to keep things organized by placing related classes and interfaces into packages."
So, think of a package like a group of related java files that are used to perform some kind of function. They are all related, and may interplay often, and so, since they are naturally related, it makes sense to group them together, say, in a package.