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What is called as ignition of fuel itself under higher temperature instead of ignition from the spark plug?

What is called as ignition of fuel itself under higher temperature instead of ignition from the spark plug? Correct Answer Detonation

Detonation is a process of spontaneous combustion of a few amounts of the air-fuel mixture in the cylinder of internal combustion engines, but before the actual ignition and not in the normal flame front. It can cause higher pressure inside the piston cylinder and there will be a pinging sound. It is called as knocking.

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If the air-fuel mixture ignites before the spark takes place at spark plug, the condition is called
In order to prevent knocking in spark ignition engines, the charge away from the spark plug should have
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A spark is produced to ignite a homogeneous air fuel mixture in the combustion chamber of an engine, it is called spark ignition system.