There are several forms of sites delivering adult content.

The most common form of adult content is a categorized list (more often it's a table) of small pictures (called "thumbnails") linked to galleries.

Before publication, Philip Elmer-De Witt used the research in a Time Magazine article, "On a Screen Near You: Cyberporn." Godwin recounts the episode in "Fighting a Cyberporn Panic" in his book Cyber Rights: Defending Free Speech in the Digital Age.

The rise of pornography websites offering photos, video clips and streaming media including live webcam access allowed greater access to pornography.

On the Web, there are both commercial and free pornography sites.

Automated software such as Aub (Assemble Usenet Binaries) allowed the automatic download and assembly of the images from a newsgroup.

There was a rapid growth in the number of posts in the early 1990s but image quality was restricted by the size of files that could be posted.

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Internet pornography is any pornography that is accessible over the Internet, primarily via websites, peer-to-peer file sharing, or Usenet newsgroups.

Pornographic images had been transmitted over the Internet as ASCII porn but to send images over network needed computers with graphics capability and also higher network bandwidth.

This was possible in the late '80s and early '90s through the use of anonymous FTP servers and through the Gopher protocol.

These are free websites that post links to commercial sites, providing a sampling of the commercial site in the form of thumbnail images, or in the form of Free Hosted Galleries—samplings of full-sized content provided and hosted by the commercial sites to promote their site.