Cosmos DB is a globally distributed, multi model database hosted by azure designed to provide hight availability.
It is a really interesting service, I recommend checking the documentation it provides a really good explanation on how it works and the theories behind it.
One interesting feature of Cosmos DB is that it provides a (easy integration)[https://docs.microsoft.com/en-us/azure/cosmos-db/change-feed] to the database event log, with is named the change feed in Cosmos.
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