What is the difference between Detonation and Pre-ignition?

Q: What is the difference between Detonation and Pre-ignition?

Detonation is when the fuel/air mixture burns all at once in the cylinder as opposed to slowly starting from the spark plug. It can occur when the engine is running too hot, when running low octane fuel, or when running too high a manifold pressure for the RPM. The symptom are engine roughness, vibration, or loss of power. Pre-ingnition is when the fuel/air mixture is igniting before the spark plug sparks. This usually happens when small accumulations of lead or carbon build up on the piston head, or commonly, on the spark plug. These accumulations heat up and ignite the fuel/air mixture out of sequence, usually during the compression stroke. The symptoms are lack of power and engine roughness.

Approach & Landing - Runup.ca - A Canadian Piloting Resource

Detonation is when the fuel/air mixture burns all at once in the cylinder as opposed to slowly starting from the spark plug. It can occur when the engine is running too hot, when running low octane fuel, or when running too high a manifold pressure for the RPM. The symptom are engine roughness, vibration, or loss of power.

Pre-ingnition is when the fuel/air mixture is igniting before the spark plug sparks. This usually happens when small accumulations of lead or carbon build up on the piston head, or commonly, on the spark plug. These accumulations heat up and ignite the fuel/air mixture out of sequence, usually during the compression stroke. The symptoms are lack of power and engine roughness.

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Objective

To learn:

the skills necessary to safely land an airplane in different conditions
how to make decisions as to what type of a landing should be made.

Motivation

Congratulations! You just made your first takeoff in an airplane. However, every airplane that takes off will land. The ability to properly land an airplane will help you to build confidence as a pilot. However, it is important that you do not designate landings as the most important skill to master in flying. Landing is one of many skills you will need to master to be a proficient and safe pilot.