Bidens, a diverse genus of flowering plants within the Asteraceae family, holds significant ecological importance across various habitats worldwide. This chapter aims to provide a comprehensive exploration of the ecological significance of Bidens species, shedding light on their multifaceted roles in ecosystem functioning, biodiversity conservation, and provision of ecosystem services. Bidens plants interact with a wide array of organisms, including pollinators, seed dispersers, and soil microbes, thereby playing crucial roles in maintaining ecosystem processes and supporting biodiversity. Their attractive flowers and nectar resources make them important for pollinator attraction, contributing to the pollination services crucial for the reproduction of numerous plant species. Furthermore, Bidens species act as providers of food and habitat for various wildlife, enhancing biodiversity in their respective ecosystems. Moreover, Bidens plants contribute to soil stabilization and nutrient cycling through their root systems and litter decomposition processes. Their ability to colonize disturbed habitats and thrive under diverse environmental conditions underscores their ecological resilience and importance in ecological succession. This chapter discusses existing literature and presents case studies to illustrate Bidens’ contributions to ecosystem dynamics and resilience. Additionally, this chapter discusses Bidens’ adaptive strategies to environmental stressors, including climate change and habitat disturbance, highlighting their capacity to persist and thrive in changing environments. By elucidating the ecological roles of Bidens, this chapter provides valuable insights into the conservation and management of ecosystems where these plants occur. Understanding and conserving Bidens habitats are essential for sustaining ecological processes, promoting biodiversity resilience, and mitigating the impacts of global environmental challenges.