For questions about the central menu for Google products available from most other Google products
The Google Launcher is a menu available from almost all consumer-grade Google applications that gives access to a large number of other Google products. It is available from an icon in form of nine squares arranged in a larger square.
The menu is customizable, allowing the user to move apps between pages, presumably allowing more-used apps to be accessible from the first page.
Google also had a downloadable app version of the Launcher, but discontinued it in 2016.
