The blockchain is maintained via a decentralized p2p network running steemd nodes. These nodes have the whole STEEM database stored on disk and the operator of those nodes can choose to open a public API for people to query against that database (e.g. get content, posts, users or even send new posts etc)
For those that know about Bitcoin, the public API is pretty much what blockchain.info API offers .. just that it is a standardized API that anyone can decide to run.
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Formal education will make you a living. Self-education will make you a fortune
Bravo!
Thanks for that answer, is steemit.com a single point of failure or is the website hosting distributed as well?
They are working on a more robust setup to my knowledge. I am pretty sure they haven't expected that kind of growth.