If you want to migrate to another note taking solution, for instance because you want to reduce the number of Google apps and services that you use, to migrate to an open source alternative, or fear that Google might kill the service eventually, then you need to figure out how to export your Google Keep data and get it imported into another note taking application. Content is synced with the cloud, and you may open notes on the Web and in the Android application. Since it is built-in on many Android devices, it is used by many Android owners as the primary note taking application. It is available as a web version, on Android, and as a browser extension for Google Chrome.
Google Keep is Google's official note taking service and application.