This document discusses several forms of electronic communication: - Email allows sending messages and files between computers connected to the internet. - Instant messaging provides real-time text communication between multiple users on computers. - Voice over Internet Protocol (VoIP) enables phone calls between users over the internet using microphones or VoIP phones. - RSS feeds syndicate frequently updated published information that users can subscribe to for automatic updates. - Blogs are websites where authors post articles for others to view and comment on, and can include text, images, music and video.