Akka in Scala, exclamation mark and question mark

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Shamelessly copied [awesome] official doc (look Send messages section for more):

Messages are sent to an Actor through one of the following methods.

! means “fire-and-forget”, e.g. send a message asynchronously and
return immediately. Also known as tell.

? sends a message
asynchronously and returns a Future representing a possible reply.
Also known as ask.

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