Chalk is a popular Node.js package for adding style and color to console output. It allows developers to enhance command-line interfaces with visually appealing text, utilizing ANSI escape codes to modify text color, background color, and apply various formatting options like bold, underline, and italics. Chalk simplifies text styling, making it easier to create informative and engaging command-line experiences, and offers a clean and intuitive API for integrating these features into your projects.