Exactly. One of the big ideas of Erlang is to have many lightweight processes (processes in the VM, not OS).
As an example say you have a chat system, you will have a process for each user [0]. If you have a million users, you will end up with a million processes. The supervisor tree watches these processes, so if one crashes a single user may get logged out but everybody else will be unaffected.
[0] In reality you'll probably have it even more fine grained than that, so users will end up with multiple processes.
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Exactly. One of the big ideas of Erlang is to have many lightweight processes (processes in the VM, not OS).
As an example say you have a chat system, you will have a process for each user [0]. If you have a million users, you will end up with a million processes. The supervisor tree watches these processes, so if one crashes a single user may get logged out but everybody else will be unaffected.
[0] In reality you'll probably have it even more fine grained than that, so users will end up with multiple processes.