HTML means Hyper Text Markup Language . Hyper Text refers to the Web's ability to link one document to another by using a hot link. This is called a Markup Language because tags are used to mark up a document to provide instructions about how it should be displayed. An HTML file is just an ordinary text file which contains the HTML tags that the HTML browser will use to display your document. Default file extensions for HTML documents are HTML or HTM but you can use any extension for your purpose.
Mailing lists offers ways for people with common interests to send messages to one another.
Unlike newsgroups, mailing lists e-mail a separate copy of the message to all people subscribed as recipients on the mailing list. Mailing lists have their own email address with which you send an email to and any message sent to that address will be re-mailed to all people on the list. All mailing lists have their own list owners. Lists owners or moderators are the ones responsible for the overall maintenance of the mailing list. Most administrative addresses are often processed by a list server programs.