map usage

A map is a data structure that stores key-value pairs, allowing you to organize and quickly access information based on unique identifiers (keys). Think of it like a real-world dictionary where each word (key) maps to its definition (value). When you need to find or update a specific piece of data, you use its key to access it efficiently, without searching through everything. Maps are useful in programming for managing collections of related data, such as user information, settings, or any grouped data that benefits from rapid lookup.