[zamadatix]

I think the dividing line is more "happens in anticipation there might be a user session which wants the data" and "happens as the result of a user session which wants the data" than it is about how it was done. E.g. prefetching content after a page load is done as a result of the user session getting to the page, it just as going around to any sites it can find to cache it on the chance the user might need them.