Codepen.io

Online community and platform for front-end developers and designers to showcase their HTML, CSS, and JavaScript code snippets, known as 'pens.' It allows users to create, share, and explore code samples in a collaborative environment, differentiating itself with features like real-time previews and a supportive community. CodePen primarily benefits front-end developers, designers, and educators looking to share their work, learn from others, and experiment with web technologies.