Apache Prefork Vs Worker Threads

We often get questions like: What is the difference between Apache Prefork vs Worker Threads? Is it wrong to have set the configuration values the same for both? Or is it wrong to have them different?

In this quick article I will shed some light between the two modules and assess what real world circumstances, a certain os and application would call for which solution.

It all goes back to the old NCSA server where Apache 1 grew up in a UNIX ...