Our aim is to propose a typology of Crowdsourcing practice that can be used both for researchers and practitioners. We show that Crowdsourcing should not only be viewed as an original way to organize innovation; we propose a typology of CS practices based on the nature of the task which is crowdsourced. Three types of tasks are considered: simple task, creative task and problem solving. Our work offers a key to understand issues related to the business models of CS, such as the participants’ motivation or trust relationships between the company and the crowd.