A VSCode Extension is a small software add-on that enhances the functionality of Visual Studio Code, a popular code editor. These extensions can provide features such as code completion, debugging tools, language support, themes, and integrations with other services. By installing extensions, users can tailor their coding environment to better fit their workflow and project needs, making development more efficient and customizable. VSCode Extensions are available through the Visual Studio Code Marketplace and can be easily managed within the editor.