In the past few decades, a new way of responding to social and environmental problems has emerge: the social entrepreneurship. It is presented as a special type of venture, in which the creation of social value prevails over the maximization of profits. Thus, the main objective of these types of ventures is to serve the community and to search for a positive social change. In this chapter, in addition to presenting the concept of social entrepreneurship and its various approaches within the so-called third sector and the emergent fourth sector, the main sources of funding that can be used by social entrepreneurs are also presented, especially business angels and crowdfunding, are detailed. New paradigms such as the collaborative economy and the circular economy are also addressed within social economy, highlighting the relationship with social entrepreneurship and the path of opportunity to foster new ventures in these fields Sin financiación No data 2019 UEM