POSIX Compliance refers to a set of standards specified by the Portable Operating System Interface (POSIX) that ensures compatibility between different operating systems. These standards define how software applications should interact with the operating system, including file handling, process management, and user interfaces. By adhering to POSIX standards, developers can create applications that run on various systems without needing significant modifications. Achieving POSIX Compliance allows for greater portability of software, meaning that programs can be easily transferred and executed across different environments. This compliance is particularly important in the development of Unix-like operating systems, as it promotes consistency and reliability, making it easier for users and developers to work across multiple platforms.