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This video tutorial introduces the concept of sets in mathematics. Sets are groups of items called elements, represented by curly braces. An empty set is shown by empty curly braces. Sets can be listed using the roster method, where elements are listed between braces, or the set builder notation, where elements are described. The notation "x ∈" is used to denote that an item is an element of a set. This concept is essential in understanding the real number line.