The Netlify Command Line Interface (CLI) is a powerful tool that streamlines the development process, allowing developers to write, test, and review code locally with ease. By installing the CLI globally using `npm install netlify-cli -g`, users can access a range of commands, including `netlify init` for quick project setup, `ntl dev` for local development servers, and `ntl deploy` for fast deployment. The CLI also offers features such as environment variable management with `ntl env:set`, serverless functions creation with `netlify functions:create`, and monitoring deployment progress with `netlify watch`. Overall, the Netlify CLI is designed to save time and streamline the development workflow, making it an essential tool for developers looking to speed up their dev time.