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This can be serious....and can be simply nothing.....
As this is the warning light, telling you that a fault is detected in the engine management system.
(except if it is the defrost, demist light....which would have nothing to do with the engine)......
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If it is the engine, then, you can remove the battery negative cable for a minute, and then refit it.....the light should turn off......if it gets back on, then you need to scan the vehicle (using a scan tool), to retrieve the fault codes....the fault codes would identify the faulty component(s) or wiring (be it catalytic converter, or other component) to be further checked and replaced accordingly.