What is mapping?

Mapping, in its broadest sense, refers to the process of associating elements from one set to elements of another set. In computer science, this can manifest in many ways. Common examples include: * **Data Structures:** Maps or Dictionaries are data structures that store key-value pairs, enabling efficient lookup of values based on their associated keys. These are used extensively for data indexing, caching, and configuration management. * **Object-Relational Mapping (ORM):** This technique connects the objects of an application to tables in a relational database. It simplifies database interactions by allowing developers to work with objects instead of directly writing SQL queries. * **Memory Mapping:** A technique that maps a portion of a file, or an entire file, into memory. This allows programs to access the file contents as if they were directly loaded into memory, improving performance for file I/O. * **URL Mapping:** In web development, URL mapping routes incoming web requests to specific handlers or functions within an application based on the URL requested. * **Functional Programming:** Mapping is a higher-order function which applies a given function to each element of a list or other iterable, returning a new list with the transformed elements. Essentially, mapping is a fundamental concept enabling transformation, association, and efficient access of data across different systems and contexts.