What is the difference between interpersonal and intrapersonal?

Intrapersonal communication is the communication that
occurs within an individual. An individual uses this type of communication for various
purposes such as analyzing situations, clarifying concepts, and reflecting upon
phenomena. There are three elements that govern intrapersonal communication, namely
self-concept, perception and expectation. An individual employs certain methods to
communicate within themselves and these are internal discourse where thinking,
concentration and analyzing occur, solo vocal communication which involves speaking out
aloud to oneself, and solo written communication that encompasses writing not intended
for others.

Interpersonal communication on the other hand
is the type of communication that takes place between people. People communicate with
each other for a number of reasons such as to explain, to teach, to inquire, and to
inform. The channel of interpersonal communication consists of four basic elements;
sender, message, medium and receiver. There are verbal and non-verbal forms of
communication that are used to conduct interpersonal communication and these include
letters, signs, notes, text messages, e-mails, memos as well as face-to-face
conversations.