Scratch is a multimedia authoring tool that can be used by students, scholars, teachers, and parents for a range of educational and entertainment constructivist purposes from math and science projects, including simulations and visualizations of experiments, recording lectures with animated presentations, to social sciences animated stories, and interactive art and music.

Simple games may be made with it, as well. Viewing the existing projects available on the Scratch website, or modifying and testing any modification without saving it requires no online registration.