Unix is a family of multitasking, multiuser computer operating systems developed in the 1970s at Bell Labs. Unix-like operating systems, including Linux and macOS, are widely used in server environments, embedded systems, and high-performance computing clusters. Unix provides features such as a hierarchical file system, process management, command-line interface (shell), networking utilities, and security mechanisms. Unix systems are known for their stability, security, and scalability, making them popular choices for mission-critical applications and server infrastructure.