The Microsoft Office 2016+ ribbon has a search bar to the right of the ribbon tabs that says "Tell me what you want to do" (see Do things quickly with Tell Me). This is a built-in implementation of the Office Labs: Search Commands, which has been available nearly since the ribbon was introduced in Office.
From the first link above: "This is a text field where you can enter words and phrases about what you want to do next and quickly get to features you want to use or actions you want to perform."
This search allows you to quickly find a command or tool without clicking through all the the ribbon tabs and manually searching through all of the groups to find what you're looking for.
This is especially handy for rarely used tools that you haven't memorized the location of, but reality in Office I find myself just using it for all but the most basic operations and I never have to learn or care where things are buried on the ribbon.