Shiki is a code highlighter that uses VS Code's textmate grammars for syntax highlighting. It's designed to produce visually appealing and accurate code snippets for various mediums, including websites, documentation, and social media. Shiki supports a wide range of languages and themes, allowing users to customize the look and feel of their highlighted code. It's commonly used in static site generators, documentation tools, and online code editors to enhance the presentation of code examples. Shiki is designed to be fast and reliable, ensuring that code is highlighted correctly and efficiently.