Unix system refers to an operating system that is based on the Unix technology. This technology has been widely used in the development of various computer systems and has become the backbone of many business applications. There are several synonyms that can be used to refer to Unix systems such as Unix-like, Unix-based, Unix-compatible, or Unix-like operating systems. Some of the most popular Unix-based systems include Linux, FreeBSD, and OpenBSD. These systems are known for their reliability, scalability, and performance, making them a popular choice in enterprise environments. In general, Unix systems are recognized for their flexibility, robustness, and ability to run on a wide range of hardware platforms.