Control system is a set of devices which perfrom the important function. it main function is to  regulate the behaviour of other devices. It has two types open control loop system and closed loop system
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what is closed loop & open loop system
An open loop is not self adjusting, it is controlled by it's input only, any internal feedback loops are fixed .
A closed loop's primary operation is not controlled by it's input, but it can dynamically adjust itself depending on the input.