Let us be clear about the definitions first.
Correction - it is a one-time activity of correcting or rectifying a mistake/error. E.g. taking a medicine for symptomatic relief from fever
Corrective action is the action taken to eliminate the cause of the mistake/error to prevent it from recurring. This involves understanding the root cause and eliminating it. E.g., identifying the actual reason for fever (viral/bacterial infection) and treating the infection
Preventive action is the action taken to prevent a potential mistake/error i.e. before it happens. E.g. maintaining proper hygiene and a healthy lifestyle to build up resistance to infections
An application-oriented question on the topic, along with responses, can be seen below. The best answer was provided by Venugopal R on 5th October 2017.
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