What is a Set?

Concepts: pySets

A set is an unordered collection of unique elements. These two properties define what makes a set different from other collection types like lists and tuples. Understanding both properties is essential for using sets correctly. The word "unordered" means that sets do not maintain any particular sequence for their elements. Unlike lists, where the first item you add stays first and the last item stays last, sets make no guarantees about element order. When you iterate over a set or print it, the elements might appear in any order. This order might even change between different runs of your program. You cannot rely on sets to preserve the order in which you added elements. The word "unique" means that each element can appear at most once in a set. If you try to add a duplicate element, the s