http://www.copyblogger.com/content-marketing-glossary/
Membership Site
A membership site is a private website that’s protected by a password that offers exclusive content and training and (often) the ability for members to interact with one another.
The cool thing is these members may pay you a recurring monthly fee, if you charge a premium to become a member.
You’ve probably come across sites like these before — just like Authority, Copyblogger’s content marketing training and networking community.
So if you’re an expert in something, and want to go beyond just blogging, creating a membership site can leverage your time significantly — and, if done right, can become a very sustainable digital business.
