I'm coming across the term 'schedule model' in the PMBOK and I don't have any real intuitive sense as to what it is: Can someone with some depth of knowledge give me a simple definition, example or a way to think about it. Please no 'best guesses' i'm confused enough on this one, need an expert!!

The Rita book says that the schedule Model simply consists of all the schedule data such as activities, dependencies, leads and lags.

Another source online says Schedule Model = (Method + Tool + Data)