What database does Obsidian run on?

I saw this earlier forum post about Obsidian’s tech stack and while it provided details about Obsidian’s tech stack, it didn’t say whether or not Obsidian was being run on a SQL type database, NoSQL, etc.

I’m trying to wrap my head around how something like Obsidian even works (which is a testament to how good the product is), and I think that other people in a similar position might benefit from the answer to this question as well.

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Text files and some IndexedDB

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why not a graph database?

Related question:

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Thanks for the response! As a follow-up question, what’s the difference in the tech between Obsidian and Obsidian Publish?