The document discusses different types of ecological interactions that occur in nature such as predation, parasitism, competition, mutualism, and commensalism. Predation benefits one organism while harming the other, such as a tiger eating a deer. Parasitism also benefits one organism, the parasite, while harming the host. Competition can initially harm both organisms as they compete for resources, but eventually benefits the stronger organism. Mutualism provides benefits to both organisms, like flowers and butterflies. Commensalism benefits one organism without affecting the other, like mango trees providing shelter for vanda plants. These ecological interactions help maintain balance in ecosystems.