Parallel streams utilize the fork/join pool which defaults to the number of available cores. This can help improve performance, but it's limited by the pool size and the fact that this is I/O-bound ...

Java's I/O streams provide standardized ways to read and write data. Any object representing a mutable data source in Java exposes methods for reading and writing its data as a stream.

An extensible terminal operation, Stream::collect, also is featured, enabling the output of a pipeline to be summarized in multiple ways. Use of streams in the Java ecosystem now is pervasive.