A mutualistic relationship in an ecosystem is one where two different species interact and both benefit from the relationship. An example is the association between pollinators like bees and flowering plants. The plants provide nectar as a food source for bees, while the bees facilitate pollination, helping the plants reproduce. These interactions enhance biodiversity and ecosystem stability, contributing to the survival of various species. Mutualism illustrates the interconnectedness of life and the importance of cooperation in ecological systems.