CodePen

CodePen is an online community and development environment where developers can create, share, and experiment with HTML, CSS, and JavaScript code. It provides a user-friendly interface and a code editor that allows users to write and preview their code in real-time. With features like code sharing, collaborative editing, and a vast collection of user-generated code snippets and projects, CodePen serves as a valuable resource for learning, showcasing, and collaborating on web development projects.