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Streams are an abstraction of a sequence of bytes.
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The sources and destinations of these sequences can be
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files
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network connections
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blocks of memory
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That is, all of these types of I/O are treated in the same way.
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The most basic I/O streams are InputStream and OutputStream. These classes have methods that can read or write a byte from the stream:
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int read ();
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void write (byte);
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also skip(), available(), close()
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There are also methods for reading and writing arrays of bytes.
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These methods all "block" on the read or write during the data transfer.
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Secs 131
