The document discusses the Wonderbag, a non-electric heat-retention cooker that allows food to continue cooking after being removed from a direct heat source. It works by retaining the heat in the bag to finish cooking the food. The target market is low-income households where collecting wood for cooking is time-consuming and contributes to deforestation. It has grown from small initial sales in South Africa to over 500,000 bags sold there and expanding distribution to other countries like Rwanda, the UK, and Kenya to provide a more sustainable cooking solution.