The History menu stores different versions of your notes and allows you to discern the changes made in each version (except for notes made with Secure Spreadsheets, which cannot be previewed easily). Each version of the note is based on changes that are made at least 5 minutes apart, and the History menu only keeps versions made within the last 30 days. This menu is available to both free users and paid subscribers.
The History menu has two categories: Session, and Remote.
Session History keeps track of revisions made to the note using your current device, while Remote History keeps track of revisions made to the note across all devices that you've signed into.
On the desktop app and web app, you'll also find the following actions when you click on the Options sub menu for Session History: