An operating system developed by Be, Inc., that runs on PowerPC systems and, until they were discontinued, the company’s original BeBox computers. Designed as a “media OS,” the BeOS was created to support the large file sizes and high-performance processing demands of digital media and the Internet. It is an object-oriented, multithreaded operating system and can be run on symmetric multiprocessing systems containing two or more processors. Like many other operating systems, the BeOS provides preemptive multitasking, virtual memory, and memory protection. It also provides high-performance input/output capabilities, a 64-bit file system that can support terabyte-sized files, and a number of Internet-related features including built-in mail and Web services. See also BeBox.