Stream

The traditional method for reading data from a file, website, or other source in .NET is to use a stream.
A stream allows you to transfer data into a data structure that you can read and manipulate.
Some streams support seeking, or finding a position within a stream the same way you might skip ahead to a different scene on a DVD movie.
Streams are commonly written to byte arrays.
Many of the stream classes in .NET support converting a byte array to a stream or reading streams into a byte array.
일반적으로 데이터, 패킷, 비트 등의 일련의 연속성을 갖는 흐름을 의미