What is mean by system and subsystem?

A system is a cohesive collection of interrelated components that work together to achieve a common goal or function. It can be part of a larger system or stand alone. A subsystem, on the other hand, is a smaller, self-contained unit within a larger system that also has its own specific functions and objectives. Together, systems and subsystems facilitate organization, efficiency, and complexity in various fields, such as engineering, Biology, and information technology.