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kind of architecture is called a monolith because there's a single server application that is responsible for all the features of the system. In our case, if a user wants to authenticate, pay us, or watch one of our movies, all the requests are going to be sent to the same server application.
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“Monolith” means “one [or single] stone.”
It's usually used to describe a monumental structure made from a single very large stone.