POSIX Time, also known as Unix time, is a system for tracking time that counts the number of seconds that have elapsed since the Unix epoch, which is defined as January 1, 1970, at 00:00:00 UTC. This method provides a simple and consistent way to represent time across different computer systems and programming languages. POSIX Time is widely used in computing, especially in operating systems and programming languages like C and Python. It helps developers manage time-related functions, such as timestamps and scheduling, by providing a standard reference point that is easy to manipulate and compare.