Ubuntu (/ʊˈbuːntʊ/ uu-BOON-tuu) is a Debian-based Linux operating system and distribution for personal computers, smartphones and network servers. It uses Unity as its default user interface. It is based on free software and named after the Southern African philosophy of ubuntu (literally, "human-ness"), which often is translated as "humanity towards others" or "the belief in a universal bond of sharing that connects all humanity".