Cacti are primarily found in desert ecosystems. These environments are characterized by low precipitation, extreme temperature variations between day and night, and often harsh living conditions. Cacti have adapted remarkably to these circumstances, developing thick, fleshy stems to store water and spines to protect against herbivores. The desert's unique features, such as sandy soil and a myriad of drought-resistant plants and animals, create a distinct ecological community. Cacti are not just limited to deserts, but they thrive in arid regions with similar conditions, showcasing their resilience and ability to flourish where few other plants can.