Zotero is a free, open-source citation management tool that allows users to organize references, insert citations into documents, and automatically generate bibliographies. It works as a plugin for the Firefox browser and can sync references across devices. Key benefits of Zotero include being free, open-source, and compatible with multiple platforms. Users can collect references automatically from websites or add them manually. Zotero integrates with word processors to easily insert citations and switch between citation styles.