Cradle to Cradle is a design philosophy developed by William McDonough and Michael Braungart that focuses on designing products and systems that positively impact the environment. The framework emphasizes the value of materials by categorizing them into two cycles: the biological cycle (materials that can safely return to the environment) and the technical cycle (materials that can be reused without degrading). C2C challenges the traditional linear model of 'take, make, dispose' by promoting a circular approach, where the end of a product's life is the beginning of a new life for the materials.