Netiquette is a set of unofficial rules for polite and respectful online behavior. The document provides guidelines for email etiquette, such as including a subject line, proofreading messages, and avoiding writing in all capital letters. It also lists rules for online communication, like remembering the humanity of others, respecting privacy and bandwidth, and keeping discussions truthful and relevant. Classroom etiquette tips include arriving on time, taking notes, making friends, avoiding phone use during class, asking questions respectfully, and respecting both teachers and classmates.