How is it different from your own server? You pay other people to run your infrastructure.
How is it different from leased VMs or containers? You pay people to set up these things to run your functions and databases when there are users that need them.
Pros: Less staff needed, less hardware needed, pay per second.
Cons. One second is more expensive than a second on your own server, so when you have 100% usage, you may run cheaper with your own stuff.
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