The document discusses five levels of communication:
1) Intrapersonal communication involves internal reflection and thinking.
2) Interpersonal communication occurs between two people through everyday interactions.
3) Public communication is a one-way interaction between a speaker and multiple listeners.
4) Small group communication involves discussion and collaboration between 3-15 people.
5) Mass communication disseminates information from one source to a large, unseen audience using media.
The document concludes by asking students to write a letter to their past, present, and future selves.