Sets In JavaScript, we have Set , which stores unique values without duplicates. Python also has a set , which behaves very similarly — it’s an unordered collection of unique elements . This makes sets perfect for tasks like removing duplicates, checking membership, and performing mathematical operations like union and intersection. Creating Sets In JavaScript: No Duplicates Allowed JS behaves the same way: Adding and Removing Items JS equivalent: Checking Membership JS: Set Operations Python sets come with powerful built-in operations that JavaScript lacks out of the box: In JS, you’d have to implement these manually with array methods. Example – Unique Customers ✅ Why it matters : Sets are the best choice when you care about uniqueness or set operations . They’re faster than lists for membership checks Provide built-in methods for union/intersection that make code much cleaner compared to JavaScript.