CodePen is an online social platform that allows members to write and share HTML, CSS, and JavaScript code snippets, typically for web development and design purposes. Key features include real-time previews when editing code, the ability to share "pens" with collaborators when working on projects, and a community to provide feedback and collaboration on projects. CodePen encourages social interactions that allow members to comment on projects and follow other members to view their work. Weekly challenges enable participants to build skills and develop new activities.

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