> We currently demand that users internalize several metaphors when interacting with Homebrew. These include:
> Formula (how to build a bit of software)
> Bottle (pre-built software)
> Cask (pre-built software on macOS)
> Tap (a collection of software)
> Keg (where software installs itself)
> Cellar (where all my software install themselves)
> As well as an additional number of less-common metaphors that contributors and maintainers need to know, like Rack, Tab, and Formulary.
