It is important to learn about these functions to ensure URLs are properly formatted for use in HTTP requests. Also for safely transmitting URLs that contain special characters or spaces. and Working with APIs that require encoded URLs for queries. By using encodeURI() and decodeURI(), developers can ensure that their URIs are properly formatted and safely transmitted across different systems and platforms.

The Intl (internationalization) API in browsers and Node JS provide a lot of useful utilities for working with language specific displays, such as the "compact" notation such as 10K, 5M, etc