IT IS WRITING IN WHICH THE THOUGHTS AND FEELINGS OF THE WRITER ARE RECORDED AS THEY OCCUR.
It is a form of writing that, rather than having an obvious plot with an obvious beginning and end, dips in and out, possibly of the thoughts of the characters, demonstrating how they interact. It is also used to refer to things that are not told in chronological order, so we may be presented with memories, or future events rather than the simple telling of an event in an ordered chronological progression.
Some might mention Joyce or Virginia Woolf's The Waves as excellent examples of stream of consiousness - I would like to think that Red Dwarf and Life on Mars are also excellent examples too!
An epistolary novel was written in the form of letters and was popular in the 1700s.
Oedipus Complex is the name for a son's romantic obsession with his mother.