Evernote is a note-taking app that allows users to sync notes, images, files and web clips across devices using cloud technology. It provides features like formatting notes, creating notebooks to organize notes, adding tags for searchability, and inserting attachments like photos or audio recordings. The document demonstrates how to create and format notes, add tags and attachments, organize notes into notebooks, and share notes and notebooks with colleagues for collaboration using Evernote. It also briefly mentions additional Evernote products and features for more advanced users.