A good source of definitions for commonly used computer and Internet terms is http://www.webopedia.com.

• alt text, alternate text, alt tag
• blog or Web log
• CD: compact disk
• CD-ROM: all caps and hyphenated
• Chat
• chatroom: one word
• database: one word
• disk, diskette
• e-communication
• e-mail
• e-newsletter
• e-postcard
• e-publishing
• forum, discussion board, bulletin board
• 56K: no space before and "K" is capitalized
• homepage: one word
• html: Hyper Text Markup Language
• Internet
• internet service provider (ISP)
• intranet
• laptop: one word
• listserv: one word, no "e"
• log in
• log on
• Macintosh: no internal caps
• Multimedia
• offline, online: no hyphen
• PC: personal computer (plural: PCs)
• PowerPoint
• real time (n.); real-time (adj.)
• URI: uniform resource identifier
• URL: uniform resource locator
• videoconferencing: one word
• Word: use after using Microsoft Word in first reference
• Web, the Web, World Wide Web (no hyphens), Web site