Twitter Hash tag: A hash tag or hashtag is a way of organizing your Tweets for Twitter search engines. Users simply prefix a message with a community driven hash tag to enable others to discover relevant posts. One commonly used hash tag on twitter is #followfriday where users network by providing the names of their favorite people to follow on Twitter.

Hypertext Markup Language: a standardized system for tagging text files to achieve font, color, graphic, and hyperlink effects on webpages.

Hypertext Transfer Protocol: is an application protocol for distributed, collaborative, hypermedia information systems. HTTP is the foundation of communication for the World Wide Web.

Hypertext Transfer Protocol Secure: is an application protocol for distributed, collaborative, hypermedia information systems using a secured connection between the end user and server.

Hyper-V is Microsoft virtualization solution. Formerly known as Windows Server Virtualization, it can create virtual machines on x86-64 systems.