Dropbox is a free cloud storage service that allows users to store, share, and access photos, documents, and videos from any device. The document provides instructions for students to create a Dropbox account, upload a Word document with screenshots explaining the process, and share it with a peer for assessment. Students are then asked to open their peer's document on Moodle, fill out a peer assessment form, and share the completed form back with their peer via Dropbox.