MINIX is a UNIX-like computer operating system based on a microkernel architecture. It is extremely small, with the part that runs in kernel mode in about 5,000 lines of source code, while the parts that run in user mode are divided into small, insulated modules which enhance system reliability. Originally designed as an educational tool, the latest versions of MINIX are also targetted at embedded systems and low-power laptops. By the project's own admission, MINIX is work in progress and is nowhere near as mature as BSD or Linux. It is released under a BSD-type licence.