This defines CPU-specific settings. Only one arch profile is enabled at install time, and cannot be changed.
subarch
This further refines the CPU-specific settings. One subarch profile is typically enabled at install time.
build
This defines the type of stability, such as current or stable, and its associated settings. One build profile is enabled, at install time, and is generally not changed.
flavor
This defines the intended use of Funtoo, such as minimal, core, workstation or desktop. One flavor is enabled, and can be changed by the user.
mix-ins
These can be enabled by the user, based on the features the user wants, such as gnome, kde, media, mate, X, and hardened.