Soil microbes constitute an array of microscopic life forms (e.g. bacteria, fungi, archaea) present in the soil, which constitute the dynamic and essential components of terrestrial ecosystems. These microbes perform various essential functions (cycling of carbon and nutrients, fixation of nitrogen, transformation, and maintenance of soil structure and stability) that lead to ecosystem sustainability worldwide. Increasing industrialisation and agricultural intensification have altered the composition and ability of soil microbes, ultimately reducing the quality of soil to serve society. The dumping of waste into the environment can lead to alterations in soil microbial communities, disrupting their function and ecosystem services, and affecting the intricate relationship between plants and microbes. However, in the last couple of decades, studies have focused on this hidden player and attempted to understand their multifaceted nature to sustain the ecosystem. In recent years, microbes with specific functions have been used to improve soil fertility, sequester carbon, and decontaminate problem soils to achieve sustainability goals. This chapter highlights the multifaceted nature of soil microbes, emphasising their silent yet transformative functions in sustaining the intricate tapestry of life on the Earth and fostering a sustainable future.