Stream, StreamReader, StreamWriter

Hi, I have to make a client-server app. and for stream I have to use the object Stream, StreamReader and StreamWriter. I am not familiar with those object. It would be good if someone could explain to me what StreamReader and StreamWriter can do. I am pretty sure that the object Stream will be used to send and received data. Is StreamWriter will enable me to write in the stream and send the data ? and StreamReader to read from the stream? Cuz those object can take a stream in parameter.