Please describe the different types of Flow that can be created with Akka Streams. What are the main differences among them, and when would you choose one over another?

Akka Streams offer various Flow types, including:

1. Simple Flow : Basic linear processing of elements.
2. Merge Flow : Combines multiple input streams into one output stream.
3. Broadcast Flow : Distributes incoming elements to multiple outputs.
4. Balance Flow : Evenly distributes elements across multiple outputs.
5. Zip Flow : Combines two input streams element-wise.
6. Concat Flow : Appends one stream after another.

Simple Flow is chosen for straightforward processing tasks. Merge Flow is used when combining data from different sources, while Broadcast and Balance Flows are suitable for parallelizing workloads. Zip Flow is ideal for correlating data from two streams, and Concat Flow is useful for sequential processing of separate streams.