24.5.1.1 What Is FreeBSD-CURRENT?
FreeBSD-CURRENT is the latest working sources for FreeBSD. This includes work in progress, experimental changes, and transitional mechanisms that might or might not be present in the next official release of the software. While many FreeBSD developers compile the FreeBSD-CURRENT source code daily, there are periods of time when the sources are not buildable. These problems are resolved as expeditiously as possible, but whether or not FreeBSD-CURRENT brings disaster or greatly desired functionality can be a matter of which exact moment you grabbed the source code in!