A "mechanism" refers to a system of parts working together to perform a specific function. It can be found in various contexts, such as in machines, biological systems, or even in social interactions. For example, the gears in a clock are a mechanism that helps keep time by moving in a coordinated way. In biology, mechanisms can describe processes like photosynthesis, where plants convert sunlight into energy. Understanding these mechanisms helps us grasp how different systems operate, whether it's a simple device or a complex living organism. Each mechanism plays a crucial role in ensuring everything functions smoothly.