Web

Formats connected with the World Wide Web, though most of them overlap into other categories; basically everything that can be put in a file format of any sort can be put on the Web, and a multiplicity of types of documents, graphics, audio, video, markup, programming languages, and more, are used there. The Web is a variety of HyperMedia, by far the most successful one.

Blogging and web hosting platforms

 * Blogger
 * Posterous
 * WordPress
 * Xanga

Development software

 * Dreamweaver site settings file (.ste)

Feeds, syndication, and metadata

 * Atom (syndication format)
 * hAtom (Microformats)
 * hListing (Microformats; product/service listings)
 * hMedia (Microformats; image/video/audio metadata)
 * hNews (Microformats; news articles)
 * hResume (Microformats; resumes/CVs)
 * hReview (Microformats; ratings/reviews)
 * RSS

Markup, documents and data

 * BBCode
 * Cascading Style Sheets (CSS)
 * HTML/XHTML
 * Markdown
 * MHTML
 * Wiki markup
 * WML
 * WOFF

Miscellaneous

 * Canonical Link Relation (rel="canonical")
 * Favicon
 * Mark of the Web
 * rel-author (Microformats; link to author homepage)
 * rel-home (Microformats; link to site homepage)
 * rel-license (Microformats; link to site license)
 * rel-nofollow (Microformats; gets robots to ignore link)
 * rel-payment (Microformats; link to payment method)
 * rel-tag (Microformats)
 * Robots Exclusion Standard (robots.txt)
 * Sitemap
 * URL shorteners

General

 * Web browser files (bookmarks, cookies, configurations, etc.)
 * Web server files (server configuration, etc.)

Specific

 * Internet Shortcut (Windows)
 * webarchive (HTML packaging format used by Apple Safari)
 * Webloc (Mac OS X)

Protocols and parameters

 * Common Gateway Interface (CGI)
 * DNS
 * Domain name
 * Gopher
 * HTTP
 * IP address
 * IPV6
 * Mime-type
 * SOAP
 * TCP/IP
 * Tor
 * URLs (and URIs, URNs, etc.)
 * WAP

Scripts/Applets/Plug-Ins

 * ActiveX
 * JavaScript / ECMAScript
 * Open Web App Manifest (.webapp)
 * VBScript
 * WMLScript