What is the practical difference between 'synthesis of published material' and 'original research' as it relates to Wikipedia's NOR policy?

The practical difference between 'synthesis of published material' and 'original research,' within Wikipedia's No Original Research (NOR) policy, lies in whether a new conclusion or position is being advanced that is not explicitly stated by the sources themselves. 'Synthesis of published material' involves combining information from multiple reliable sources to present a coherent overview of a topic. This is acceptable as long as the synthesis does not create or imply a ....