how SharePoint actually works?

If some one ask in interview that how SharePoint actually works? is this correct answer or this is too short?

In order to understand how WSS works with IIS, we need to first understand the concept of HttpHandlers and HttpModules.

Using HttpHandlers and HttpModules, a request is first passed through the SharePoint runtime and then passed to the ASP.NET runtime (aspnet_isapi.dll).

if it is too short then what is the actual answer for this?

What is the name of SharePoint Runtime file?