https://chemicalengineeringnob.com/2018/10/29/process-control-is-a-major-thing-you-need-to-know/

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Process Control is a major thing you need to know:
Process is a natural or artificial progressive continually operations consisting of series of control actions or relatively fixed, successive and gradual changes leading towards a particular result.

process control involves the measurement of the values of a controlled variable and applying manipulated variables to the system to limit or correct the deviation of measured value from a desired value. This serves in system modeling in response of system .

Types of process control
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https://chemicalengineeringnob.com/2018/10/29/process-control-is-a-major-thing-you-need-to-know/