Bacillus subtills is a Gram-positive, rod-shaped, aerobic, non-pathogenic bacterium that synthesizes resilient endospores. Due to the capability of forming spores, the organism has ecological versatility that allows the organism to thrive in distinct environments such as soil, rhizospheric zones of plants, and even in the gastrointestinal tracts of animals. It is widely known as a plant growth-promoting rhizobacterium (PGPR) that enhances plants’ growth by producing various primary and secondary metabolites such as phytohormones, volatile organic compounds (VOC), enzymes (exo), biosurfactants, siderophores, solubilizing phosphate, and fixing nitrogen. The bacterium’s utility in agriculture is further supported by various formulation and delivery methods, enhancing its effectiveness as a biopesticide and biofertilizer. Additionally, B. subtilis contributes to soil health and sustainability by forming protective biofilms and generating antimicrobial compounds, which suppress the progression of deleterious microorganisms. Metabolites of the bacterium also degrade and remediates heavy metals and hydrocarbons that aids in maintaining sustainability in the environment. Despite its wide-ranging values, challenges are still there in terms of its usage optimization. Future perspectives are highly required that would enhance all its beneficial traits and integrate B. subtilis into integrated pest management (IPM) systems as a potential pollutant remediator to promote sustainable agricultural and environmental practices, which are documented in the ‑chapter.