We can convert our objects to streams of bytes. We can also convert streams of bytes back to objects. The I/O stream library provides such functionality.
Streams can be output streams and input streams.
Remember the std::cout and std::cin? Those are also streams. For example, the std::cout is an output stream. It takes whatever objects we supply to it and converts them to a byte stream, which then goes to our monitor. Conversely, std::cin is an input stream. It takes the input from the keyboard and converts that input to our objects.
There are different kinds of I/O streams, ...
