The core activity of ClickFunnels is the development and provision of a Software-as-a-Service (SaaS) platform for online marketing and sales. The platform enables users to create sales funnels, design websites, sell online courses, conduct email marketing campaigns, and manage customer relationships. The platform also offers features such as A/B testing, workflows, countdown funnels, and integrations with other tools. The company also supports its customers through coaching, events, and community management.