Evernote is a note-taking and organizational tool that allows users to scan documents, take audio recordings, clip content from the web, and share notes. The presenter discussed how Evernote can be used across devices like Mac, Windows, iPhone, and Android to organize notes into notebooks with tags, search saved content, and collaborate by sharing notes with others. Evernote provides an integrated system for writing, collecting, finding, and presenting information across a user's devices.