Instapaper is a web-based application that allows users to save articles and web pages for later reading. It simplifies the reading experience by stripping away ads and other distractions, presenting content in a clean, easy-to-read format. Users can access their saved articles on various devices, including smartphones and tablets. The platform also offers features like highlighting text, adding notes, and organizing saved content into folders. Instapaper is particularly useful for people who want to curate their reading material and enjoy a focused reading experience without interruptions from the web.