Membership sites are those that require users to register and log in, in order to view content. User registration can be a valuable lead-capture source, or even better, a source of recurring income! Create unique content that is valuable to users, like an online learning course, or even a forum where users can get exclusive insights and conversation. Membership sites can also be related to or integrated with software as a service (SaaS) or “on-demand software” — where you create services that users pay recurring fees for and log in to use. The possibilities are endless!