A membership site is like a portal where you offer particular services to people who sign up to be members. This means they may pay a fee to join the club or contribute their efforts in providing the service for free. The site will allow your fans and customer base to gather at one place and exchange ideas or have discussions.
For example…
Sarah runs a membership site for health and lifestyle bloggers. She started off with a handful of friends who posed as her fans and “liked” the topics she was blogging on. Soon, her name and ideas spread through social media channels and Sarah tuned her blog into a membership site where she could offer health and lifestyle tips for people in a similar boat as her. She set up a low joining fee of five dollars and this meant the member could access the entire history of content, contribute to discussions and participate in webinars.