Engine No Start Conditions are exactly what they sound like.
For some reason your engine did not start. There are a number of conditions that can affect why the engine did not start.
All components have to be working perfectly and in balance to perform this task. A combination of different parts will force the Fuel/Air mixture into the cylinder, where a Spark created by the Ignition System will ignite this mixture. If the Compression in the engine is high enough and all this happens at the right Time, the engine will start.