Highlight.js is a popular syntax highlighting library designed to enhance code readability on web pages by colorizing code snippets in over 190 programming languages. It automatically detects the language of the code block and applies appropriate styles for better clarity, aiding developers and readers alike. The library is easy to integrate and customize, providing options to choose from a variety of themes to match the design of any website. Highlight.js is often used in blogs, documentation, and forums where presenting clean and identifiable code is essential.