What is meant by package?

Question

Diffrence between Class and Package in terms of access modifiers public private protected of variables

Answer 1

Can you elaborate using code example or any other analogy?

Answer 2

So for understanding can i use the following analogy?
Package = University
Classes = Colleges affl to University
Objects = Courses offered in colleges
Variables = students and teachers
Methods = teaching and examination

Answer 3

So Package is not only collection of Classes, but collection of interacting(inter-linked){didnt know the exact word} Classes?