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Heading Tag
An HTML attribute used to denote page content - emphasizes page content to search engines.

Hidden Keywords
Keywords placed in the HTML source in such a way that they are not viewable by human visitors.

Hits
A download of a file from a web server - hits do not represent actual, or unique web page visits.

.htaccess (Hypertext Access)
The default name of Apache's directory-level configuration file. It provides the ability to customize configuration directives defined in the main configuration file.

HTML
Stands for HyperText Markup Language - the programming language used to mark up web content and display it in a formatted manner.

HTML Source
Raw, unrendered programming code.

HTTP (Hypertext Transfer Protocol)
A generic, stateless, protocol which can be used for many tasks.

HTTPS (HyperText Transfer Protocol Secure)
Same as HTTP, but has security features enabled to protect sensitive data.

Hub
A central, industry-specific and well-known point for information; usually has many outbound links rather than inbounds.

Hyperlink Text
A text based link.

Hyperlinks
Links that take a visitor or a spider to another location; can be either images or text.

IBL (In-Bound Link)
A link residing on another site that points to your site.

ICRA (Internet Content Rating Association)
The Internet Content Rating Association (ICRA) is an international, non-profit organization allegedly working to make the Internet safer for children.

Impression
Access of a page or banner ad. Often used interchangeably with the term pageview.

Inbound Links
Links that point to your site from other sites.

Index
A term used to describe the database that holds all the web pages crawled by the search engine for each website. Also commonly used to denote the root address, or home page of a domain.

Information Architecture
Process of gathering, organizing, and presenting information to serve a purpose.

Internal Link
A link that points to another page within the same site - commonly used for navigation.

Internet
An interconnected system of networks connecting computers around the world via the TCP/IP protocol.

Interstitials
Loads a commercial in the background of a Web page. When the user exits the page, the user gets served a full-page, between-page advertisement in Flash, an animated gif or other rich media.

Invisible Web
Refers to the vast amount of information on the web that is not indexed by the search engines.

IP (Internet Protocol)
Allows machines to communicate to each other via the Internet.

IP Address (Internet Protocol Address)
A method by which data finds its way back and forth from your computer to the Internet.