Sustainability has become a key concept in the business world in the past decades. It represents a holistic approach that covers several topics such as environmental issues, social equity or economic development. Companies have understood the need of integrating sustainability in their business models. Business models are connected with their value propositions and show the way companies operate. The old business models are no longer possible. They were grounded only on an economic foundation. The new business models are increasingly sustainable business models that align the profit imperative with the social and environmental benefits. The aims of our paper are to define the concept of sustainable business model and to highlight its significance in the current business world. Our research is based on a literature review.