Map in Java

What is Map in Java Collections? A Map in Java (from Java Collections Framework) is a data structure that stores data in key–value pairs. Each key is unique Each value is mapped to a key Think of it like a dictionary: word → meaning Example: 101 → "John" 102 → "Alice" Why do we use Map? We use a Map when: --> We need fast lookup using a key --> We want to store pairs of related data --> We need unique keys Real-world examples: Student ID → Name Username → Password Product ID → Price Common Map I