Explain what a Map data structure is and how it is typically used in programming.

Map is a data structure that stores key-value pairs. Each key is unique and associated with a specific value. In programming, Map is used for fast lookup, insertion, and deletion of data by key.

For example, in JavaScript (Node.js), Map can be used as follows:

const map = new Map();
map.set('user1', {name: 'Ivan', age: 30});
map.set('user2', {name: 'Maria', age: 25});

console.log(map.get('user1')); // {name: 'Ivan', age: 30}

Map is useful when you need to store and quickly retrieve data by a unique identifier, such as caching query results or storing user settings.