Schema stitching (Apollo Federation) VS Schema merging

I am struggling right now to tell the difference between schema stitching (which is what Apollo Federation is, in a nutshell- if I understood correctly) and schema merging. It is very confusing to me because In some materials I’ve read these two terms are used interchangeably, yet in others, it’s been stated they have different purposes. Could you please clarify each of the two’s use cases ? Thank you!

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