Explanation

Common types of sets:

1. Finite Set – has a countable number of elements
   Example: {1, 2, 3, 4}

2. Infinite Set – has unlimited elements
   Example: {1, 2, 3, …}

3. Empty or Null Set – contains no elements
   Example: ∅

4. Subset – all elements of one set are in another
   Example: A = {1, 2}, B = {1, 2, 3} → A ⊆ B

5. Universal Set – contains all elements under consideration
   Example: U = {1, 2, 3, 4, 5, 6}